I like to complete a game before moving onto another. I will exclude almost immediately anything that is more than 40 hours because it will most certainly be bloated and uninteresting.
Some genres, after 30 years of gaming, became pretty uninteresting to me. As if no game delivers anything new. Fighting games is an example. Nothing can beat Dead or Alive, basically. It has been like this for years... I also really love JRPGs but despise most of what they have become.
I have a few games that are my go-to games : I will always come back to them indifferently from the current game I decided to complete. Games that can offer a good, fun session of 1 hour.
Examples :
Phantasy Star Online v2 (doing one or two areas)
Dead Cells (doing a couple runs)
Dead or Alive 6 (3 or 4 arcade runs)
Most Sonic games (all stages of Unleashed, or Shadow Generation, or a complete run of Mania)
Night Striker on Sega-CD
Burning Ranger (one level)
Nights (all stages once)
Any good beat'em up or shoot'em up
etc...
Based on this, I will simply pick a longer game, complete it, and then move on to another. And every once in a while, play another shorter game that doesn't require more than an hour of investment to have fun and complete something.
Recently, I have completed (longer games) :
Witch on the Holy Night (really surprised by how good it was)
Tomb Raider I II III (I and III were particularly awesome, II was pretty bad)
Tsukihime (a bit disappointing)
FF VIII remastered (as awesome as I remembered)
FF VII remastered (was pretty bad)
Phantasy Star II (greatest RPG ever)
Ninja Gaiden 2 Black (was absolute poop)
Panzer Dragoon Saga (legendary game)
Currently on Grandia, but the game is super boring (10 hours in). On the verge of dropping it. Thinking of doing Metroid Dread again.
One thing I am planning to do and know I will regret : getting Xenoblade Chronicles X on Switch. Absolutely love the game, couldn't complete it on Wii U, and will probably never be able to...