What the others said.

Maybe you need to take a break from games and indulge in some other, or new, hobby.

I like audiobooks, electric skateboards, cycling, manga... And more.

You could also expand the kinds of games you play. I keep trying new genres and if one gets boring I try something else.

Don't force yourself if you aren't having fun. That's a quick way to really ruin something you like.

I've gone through several episodes of feeling like there's nothing I want to play... But, if I keep giving things a chance, and make sure not to burn myself out by trying to find something too hard, or forcing myself to play something because it "supposed" to be fun, even when right then it isnt, something eventually gets me hooked right back in.

Most recently that has been Deadlock. I can't get enough of it and the feeling is the best.