I'm stuck in that same kind of gaming rut, I think it's because dealing with "being an adult with responsibilities" is a lot more stress than when I first started gaming as a kid. My brain just does not want to learn a new system of rules, and I end up quitting new games halfway through the tutorial.

The couple times I've fought through that feeling, I've found a few new games I really love. So maybe it's a mindset thing. I miss the ease with which I used to lose myself in new passions.