I want to say "Baldur's Gate 1+2", but I'm honestly not sure that I'd have the patience to learn the fight system nowadays. I still never finished the Throne of Bhaal expansion (even though it actually finishes the story of the first two games, it's basically Baldur's Gate 3), because high level play becomes such a hassle.

Second retro favourite after that is probably Pillars of Eternity 2, the atmosphere wasn't as good as in PoE 1 but the gameplay is way better. I'd definitely be up for playing that right now.