I’ve only really used AnysoftKeyboard and Heliboard myself. But my mobile keyboard ‘needs’ are really low - mostly some specifics around terminal keys and multi-language.

Honestly, if your setup works for you maybe don’t rush into changing right now. Don’t let perfect be the enemy of good and so on. When you have the time and motivation you can always take some time to investigate the other options more in-depth! Sorry I can’t be of more help here

Yup, it’s not FOSS but FUTO did some semi-shady definition shuffling so it would sound like it was, in the past.

That, combined with some other recent drama about more shady behaviour, mean I’ll probably generally avoid things coming out of them.

For truly FOSS android keyboards afaik there is Florisboard, Heliboard, AnysoftKey, Fossify Keyboard or Unexpected keyboard, as well as a couple more experimental options.