Unironicially Robocop (the game) is pretty good but it's barely an RPG aside from dialogue options and sidequests
Here's my top 5 maybe you'll like them:
Icarus (it's more open world survival but has some rpg elements like a skilltree)
Indiana Jones (the one that crashes your pc if you have a bad one)
Oblivion (remaster and the original since the gameplay hasn't changed one iota as far as I can tell)
The stalker games (all of them except 2) are pretty good RPGs but have more of a focus on the shooting side instead of the RPG side.
For honor is supposed to also be a pretty good RPG but I haven't gotten the chance to truly play it yet, it's a little too complex for me.
All of them are on GP apart from icarus