I’ve looked at a few on fdroid and they all seem like they aren’t being maintained anymore.
Edit: I’ve spent the past day trying most all of the suggested keyboards here and I think I’ve landed on either Unexpected Keyboard or AnySoftKeyboard. Thanks for all the suggestions. Thumbkey is quite the thing to get used to.
No, I didn’t have trouble, OB have less prediction than Gboard but I use my personal library. For me it’s better than Gboard because its Foss and strictly privacy.