Hello! You may already be aware but Godot v4 has been released!
Have a look:
https://godotengine.org/article/godot-4-0-sets-sail/
Unfortunately for The Arcane Relics (TAR) another rewrite is inevitable... There's been a number of API changes, among other things, that would make it much more difficult to continue using the same Godot v3 project we started instead of starting over. Nonetheless, We've learned a lot since starting the use of Godot and making the Godot v3 version of TAR.
We plan to keep the old Unity version up on itch.io and setup a new page for the Godot version of TAR, eventually.
-Jon