If you like space games, X3 and X4 can probably eat up lots and lots of your time. Space Engineers if you're less interested in flying, space economics and creating a supply chain (which X lets you) and more in gathering materials and creating all sorts of weird, funny or actually amazing stuff. SE is probably better played with at least 1 other person, possibly more, while X is exclusively single player.
Grand Strategy games can also obliterate your free time. Civilization 5, any Total War game. Hell, Age of Empires 2 can have very long matches if you play on huge maps and people have loved that game for over 20 years.
You can also go for Fallout 4 or Skyrim with extra content mods, like dungeons, quests or areas.
Personally, I'm just past 400h on Palworld, so I'd recommend it as well. I've played from start to "finish" some 4 times by now. Official servers will be wiped sometime in December, possibly with a new patch arriving, but you can always play single player and even invite a friend to play on your local save and never lose progress (unless the save gets corrupted, which can happen).
The one good thing the PS5 pro brought was the news that scalpers got fucked up because the demand is so damn low