Yeah I think having just one big game on the go is a good idea - spreading your attention too thin between games probably lessens your enjoyment of all of them!
I’m a little bad for this as I’m currently playing one game on PS5, Steam Deck and Switch each. But I stick to one game per console and it seems to work ok. I like having a variety of games to play depending on my mood - 3 seems a good limit. But when I do play each, I make sure to focus on that particular game for a while and not let myself get distracted by the others.