I resigned a couple years ago to using the default aosp keyboard as well, only to find out a couple of weeks ago about heliboard. It has gesture typing and multilingual support, which I missed from gboard. autocorrect is still crap, but i’m already used to it, so for me it was an all around improvement. quite surprised to see others not liking it
had the same question. after some research, I’m planning to switch to posteo.de