Fallout is a good choice, although maybe this time Arcanum could have been the better first choice despite being not as focused or well designed, since it's a more ambitious game with tons of role-playing options and quests.
If you really want to scratch your Morrowind itch, and don't mind trying out older titles, you should play Ultima: Underworld (basically proto-Morrowind set in a giant dungeon, a very immersive first-person game), Darklands (the superior sandbox experience, with a very interesting setting, simulationist mechanics, and quests with multiple solutions), Gothic 1 (tighter gameplay and setting than Morrowind, and technically a better game, but it doesn't feel as creative and it's more restrictive gameplaywise), Daggerfall (not as good or well designed as Ultima Underworld, but definitely a more ambitious title with tons of content and hundreds of towns to explore), Ultima IV (a very old exploration-focused game that offers tons of freedom, innovative non-violent mechanics and an excellent plot), Arx Fatalis (a more modern Ultima Underworld successor, it's a well crafted game but I didn't like it as much)... And if you need to play more modern RPGs because you're a spoiled zoomer, you could try Expeditions: Conquistador and The Age of Decadence.
In other words, you should avoid combatfag and storyfag games until you feel more comfortable with this genre, and focus on immershunfaggotry and exploration-heavy games with tons of customization options for your characters. Avoid blobbers (except maybe Wizardry 8, Wizards and Warriors and Dragon Wars, which are exploration-heavy and not-as-abstract games), tacticool turn-based games and genocide-simulators in general (including 99% of JRPGs) and storyfaggotry in general.