Ironsworn. https://github.com/Billiam/awesome-ironsworn

There’s also a card game called scoundrel that’s like a dungeon crawl and free (there are how to play videos on YouTube).

Arkham Horror LCG can be soloed and is good but costly.

Your Pokémon comparison reminds me of something I’ve noticed with gaming. Sometimes the game just has to hit me at the right time, regardless of nostalgia. I’ve had games that I bounced off of multiple times, then years later I decide to give it a go and get sucked in. I’m fairly sure this sometimes happens due to other factors in my life at the time (situations I’m currently experiencing, things I haven’t experienced, etc.).

For me, personally, these games are the closest thing on a computer to a nearly endless sandbox tabletop rpg experience. I don’t like having to do some grand “save the world” narrative that RPGs push you into, and in Skyrim I can avoid it after the intro or mod it out. Then I create characters like a tabletop RPG (I develop a backstory and where I choose to go and what I choose to do is based on the character’s personality in my mind) and essentially play it like it is a solo tabletop game where the engine takes care of a lot of the work.

I haven’t played in years, though, because I can’t get the same level of immersion as I did when playing for 5 hours straight before having kids.