Surprisingly, Baldur's Gate 3. I absolutely love D&D, but I tried playing through the Pathfinder video games, Pillars of Eternity, Divinity: Original Sin 2, and nothing stuck with me. I just wasn't a fan of the CRPG genre, despite me playing in-person tabletop RPGs multiple times a week.

I bought BG3 thinking I probably wouldn't get hooked, but I didn't want to miss out when literally every one of my friends is playing it. Well, I am absolutely hooked and have 40 hours in the game and will likely do multiple playthroughs, and I kind of "get" the genre now. I know PoE, PF, or DOS2 may not be as good, but I feel a lot more confident at the prospect of playing them now.

So in this case, FOMO helped me a great deal.