Do you negotiate GE?
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INA is my current era, CA and LMA were both 2K before I advanced and it wasn't near enough. With RQs, GBs incidents, treasure hunt, WWs all moving up in age with you you quickly dwindle previous eras goods in GE. I'm being 100% honest with you and not trying to troll you in anyway. Even if you do not negotiate any of GE I do not think your current stock pile will even be good enough for the tech tree and is certainly not enough for a CA GB.
If you've been doing all this trading down though, where is it reflected in your stockpile? Are you just doing the math and thinking you could turn over 100K goods from FE-LMA? I think if you'd try it you'd see how difficult it is to find all ages trade partners.