I feel you, OP.
24 now, doing a full-time, quite strenous and stressful graduate program in university and I don't have the energy or will to spend a huge amount of hours in a single game. It's not just me, though – I partially blame the industry, too, and it's damn obsession with massive open-world titles that suck out 50-100 hours of your time, many of which are spent with often mindless side-quests, grinding, collectibles and flag-checking on a map. 2018 was full of these games, and that's why I felt burned out and considered taking a break from videogames altogether. I realized I need focus – give me clear, linear, pre-defined scenarios and stories and I'll still enjoy my time. Resident Evil 2 and Devil May Cry 5 did just that and now I feel a little refreshed. I'm just tired of aimless slogs that swarm you with half-cooked ideas only for the sake of content.
My advice – play a bit more shorter, self-contained games that don't constantly beg for your attention. Or go back to some of your backlog games or old favorites to remind yourself why you're doing this in the first place. Also, your post doesn't necessarily indicate otherwise, but don't feel bad about dropping games. Time is precious.