For me AutoKey is absolutely essential to my workflow. I have tons of text expansions and shortcuts to "remap" keys. E.g., respectively, typing dAt expands into 2025-05-08, 13:47:40 CEST, and pressing alt + k simulates the arrow down key.
Secondly there's XScreenSaver which has so many wonderful (mathematical) visualizations that it would be a damn shame if these eventually get lost as Wayland gets more adoption.
None of these have Wayland alternatives as far as I know. For text expansion there's Espanso, but it doesn't support keyboard shortcuts yet.