It's a sub genre of fantasy, basically it's a fantasy setting with a gaming/tabletop twist. The "focus" of these type of stories is more on the hero getting stronger over time (grinding, unlocking stuff), rather than an overachieving plot (saving the world from evil king).

There is a subreddit about it too, quite decent (as smaller, more niche communities tend to be).

There are a few good books (The Cradle Series), web novels (Defiance of the Fall), and even mangas with this idea in mind (Like "The Gamer" Manwha, or "Solo leveling only")