Could you please port the mod to 1.21.4 and newer

Sorry, I have no plans to support any of the versions above 1.21.1, until Mojang decide to stop doing such frequent drops with major breaking changes inside.

This update schedule is impossible to keep up with since modding isn’t my full-time job.

Oh, ok. I understand that since you are a single dev in this project. and I didn't know that it was so difficult to update them, because some mods only require small changes for the 21.4 update when coming from 21.1(for example changing things in gradle.properties.)