I’m a fool that cannot seems to remember how words are supposed to be typed, thus I’m heavily relaying on auto-correct or suggestions like OpenBoard does. If Unexpected Keyboard would support that, I see myself switch to it as my main board

You could try the FOSS option on Fdroid: Yet Another Call Blocker

Linux Mint Cinnamon. Stable, yet tons of customizations possible and makes the jump from Windows a whole lot easier (I jumped 1.5 years ago and will never look back).