I try to keep it down to a few categories.

There are always a few fighting games I'm playing; typically Skullgirls, Guilty Gear Strive, and Street Fighter 6. When a new one comes out, I tend to spend a few dozen hours learning it before moving on.

Then there's a story/campaign game. Right now, it's Metaphor: ReFantazio.

Then there's a "shut your brain off"/"second screen"/"podcast" game. Currently that's Borderlands. It doesn't mean that I'm always listening to something while playing it, but it does mean I don't have to think too hard to enjoy it, and I can consume it like junk food. I may not have the highest opinion of these games, but it's good to have some of them as palate cleansers.

Then there's whatever game I'm in the middle of playing co-op with friends. Currently that's V Rising.

The above is what my plan is, but it rarely goes that way. Often times I'm in the middle of a campaign/story game, and then the new, shiny thing came out before I finish it, and I can't help myself but to start up the new one too, so I've accumulated a running total of other games I'm in the middle of and haven't finished. As for time management, mine is a DINK household, so there's plenty to go around, even after social gatherings and such, but our schedules tend to be fluids that will expand to fit their containers. I've begun to arrive at something similar to an Agile board, if you're familiar with software development. I've got a number of games that I intend to finish before the month is out, and based on HowLongToBeat data, I'm estimating how much time I'll probably have to play them and how long it will likely take me to finish them. This is a new development for me from the past few months, but it's starting to pay dividends...then again, that may also have to do with new releases slowing down at the end of the year.