Have you considered Enderal? It’s a total conversion mod for Skyrim on steam, so the bones of it are the simpler Skyrim systems- but it overhauls everything and has excellent world building and quests to boot. A full mage playthrough/build is very fun/rewarding. Just understand that it is NOT Skyrim. It looks like it sometimes, and there’s definitely still that Bethesda jank, but it’s its own beast.