I recently wanted to find a new good one so I bought about 8 first issues of different series by just randomly browsing the categories I like for good drawing and interesting synopsis
if you're having trouble finding recommendations for something similar to one of the most critically acclaimed anime of the last 20 years then you don't know how to use the internet
I think it's "epic story about the humanity" like Odyssey
I've watched Legend of the Galactic Heroes btw but it's not exactly like that, it's more about politics and genius protagonists like in Code Geass, and that's not the whole point of TTGL at all