First of all, is there anything differnt in different worlds that is not available in Parkhog? Are the cities, goals, technologies, events, and objectives different from world to world? I truly have no interest in doing the same thing again from scratch if there is nothing different to obtain.
Nothing intrinsic is different from world to world, although the different players and the world's relative age makes for different dynamics in interactions with various players. Also, starting new cities allows one to try different play styles, such as not using GBs at all or only using Build menu buildings (meaning no event/special buildings) or playing without fighting as much as possible, or fighting everything and negotiating as little as possible. There are players that have built "Tiny Towns" where they never place an expansion and see how well they can develop a city with extremely limited space. Another thing is socialization. I have met many fine (and some not-so-fine) people on every world where I've had a city. There are a lot of players for whom the social aspect of the game is the most important. However, if just "winning" getting to the end is all you care about, then doing it over again on another world would be a waste of your time.
Why are low levels of GB important? Let me give you a couple of examples: My Arc is at level 46 and what I get there is 94 of each of the ores available on Venus. Do I get anything different (other than Venus ores) by getting up to level 80? I mean, I already have 17,000 soybeans (least amount of Venus ores of my Venus ore cache). Why would getting 170 soybeans at age 80 make me want to get there and get there as soon as possible? I already have more soybeans that I can use on anything! I am level 35 of Alcatraz and getting 34 new soldiers of my age every day. What benefit would I get if I got it up to level 80 and get 79 soldiers a day if I already have 2900 soldiers I need of that age?
Well, for one thing that's why you're only ranked 492nd in Parkog. GBs provide massive ranking points and it grows with each level. The reason those 491 players are ahead of you isn't because they've been playing longer, as you claim, but because they have hyper leveled (at least level 80) many, if not most, of their GBs. You say there is nothing you can do to catch any of them, but getting your GBs up to at least 80, starting with the Arc and then working on your att/def boost GBs, would almost definitely move you up in ranking. How high, I don't know, but you would be surprised.
As far as your Arc goes, it does not give you goods. It puts goods in the guild Treasury. Ask your guild leaders how important that is, and why you should maximize your production there. Especially where GBG is concerned.
The lack of savvy that you mention, does that mean that having more of what you don't need anyhow mean lack of savvy? Why do I want more of any of these things if more is not going to get me anything different than what I already have? Is that what savvy of the game supposed to do "make you happy you have more than you can ever use?
I don't mean this disrespectfully, but this paragraph makes me think you need to look up what "savvy" means. It has nothing to do with what you have, it has everything to do with what you know. And your preceding paragraph about GBs is just further evidence of what you apparently have missed learning about the game.
What are you shooting for in this game? Your goal is to have more than anyone else? Is that your goal? If that was my goal, I would put my efforts into something that actually gave me more in life than game coins, game supplies, game medals, game products or game forge points. If wanting to be the $1, I would try to be the best trader in the stock market, the best CEO of a company so that I could get more of a reputation and income in my real life and not in fake (non spendable) ways. Even in those areas, there is a limit to the benefits aren't there. If in real life you are already making more money than you (and your family) could spend on 20 lifetimes, why would you be shooting for more?
So much to unpack here that I hesitate to even comment on it. I will answer the initial question in this paragraph, though. I play this game strictly for relaxation and enjoyment. That means different things to me at different times. When I first started the game, I had a bit of the "accomplishing" or "winning" attitude, but that only lasted about a year at the most. After that for a long time it was socialization and working with as a team within a guild. Then a few times it was leading a guild. Teaching newer players about the game has often been rewarding to me. Sharing my in-game wealth with newer players also is extremely rewarding to me.
In this game, and in real life, I have never been concerned with "being the best" of anything but myself. I try to be the best "me" that I can be and leave the measuring against others (or measuring of possessions and/or accomplishments) to everybody else. In other words, what's important to me isn't "what I have", it's "what I am". I can look in the mirror on my best day and on my worst day and still be happy with who I am. Apparently that is rare in this world today.
You do need to explain what it is you are shooting for and why you think I should shoot for the same thing and where I am failing at it. Be specific as your words so far have been very general in nature. I don't understand general things. Having objectives is not ever reached by having general thoughts.
And here is where we have completely different mindsets when it comes to this game...and why I can probably play it for decades without being bored. You are (apparently) solely concerned with setting and achieving tangible "objectives", while I am much more concerned with the intangibles, such as personal enjoyment (fun) and socialization. I am curious about "what happens if I play like this" or "what happens if I do it that way". You, again apparently, are not. Life isn't about "having objectives". It's about being productive, yes, but it's more about experiencing the fullness of life. Personally, I hope you find that curiosity and relax your objective-focused mindset. Not because I'm being disrespectful, but because there is beauty in life, and even in this game, that you miss by being that way.