had the same question. after some research, I'm planning to switch to posteo.de

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