Maybe it’s just me, but I’d play the hell out of BG3 when I was 12.
The amount of time I spent on TES 4 and 5 back then, and BG3 hits just the right spot with the variety of ways it allows you to play it.
Minecraft is also in my top favorites.
What I’m saying is, don’t count BG3 out completely. Not to mention that it’s very saturated, so a shorter attention span shouldn’t really be a problem, but you never know.
As for suggestions. Definitely Terraria, as others mentioned. There was also Lego Fortnite, which looks like it would fit the tastes. Maybe also party games?