Unexpected keyboard [^1] has been a game changer for me. As far as I know, it's the only full-size keyboard that features swiping towards the corners of keys for numbers and special characters instead of tapping and holding. As a bonus, it weighs in at under a megabyte.

Edit: another comment mentioned Thumb-Key [^2], which has a similar swipe feature.

[^1]: https://f-droid.org/packages/juloo.keyboard2/ [^2]: https://github.com/dessalines/thumb-key