I've always felt as though I'm unable to fully enjoy RPGs. Final Fantasy is one of my favourite series of games, but outside of that it's pretty limited. Undertale was probably the last RPG I played that I liked, mostly because it did something different with the combat system and the puzzle aspects weren't too over the top. I feel the same way about CrossCode, but I would put that game into a different category as it isn't a traditional RPG.
I just don't want to sink a ton of time into a game that is mostly a grind with story elements and payoffs that are few and far between when I could play a different kind of game that is at least continuously stimulating.
I had a lot of time for the original Fallouts back in the day (1 & 2). Had a charm and sense of humour to it hard to beat. They were genuinely fun to explore. I'm not sure how well they've aged though. Most games these days are too washed in the corporate PC they have no soul to them. That said the Mass Effect trilogy I loved as a pseudo RPG because I'm a sci-fi junkie. Didn't mind Dragon Age as well. It's a shame Bioware is dead in the water these days. I did enjoy the Witcher series, probably the most recent RPG I sank a decent amount of time into.