Ooooh. Now i can pick it back up and finish it. I really like when a story has a definitive ending, a lot just go on and on untill its dropped never to be finished. Yeah it would be nice if there were more, but finishing this story will lead to the start of the next one.
Its less gundam mechas and more space opera masterpiece with mechas, but i recommend Mugen no Ryvius/Infinite Ryvius. Imagine lord of the flies but in space.
https://myanimelist.net/anime/593/Mugen_no_Ryvius
Edit: also eureka seven is a master piece too. Not Ao though, dont bother.