There's Swiftkey, which has nothing in particular to recommend it other than not being Gboard and is the reason Microsoft killed Swype after it acquired it, and dozens of deeply stupid emoji keyboards. I suspect Swiftkey is giving the same telemetry to Microsoft that Gboard gives to Google.
Typewise is supposed to be privacy-respecting, but it costs an eye-watering
twenty five dollars and
Fossify Keyboard, which is just a keyboard with no internet functionality at all.
I was about to recommend Simple Keyboard as well, but it turns out that the guy who made all the "Simple Mobile" apps sold his soul to an advertising company early this year and now all his applications are garbage. You can get the non-garbage versions from Fdroid but there's zero chance LM will use a third party and entirely open source app store and we all know that.
Absolute aside, but if anyone doesn't know this, [windows key] + . opens the symbols and emoji picker in Windows 8 and newer OSes.