Most of these have been mentioned already, but it all depends on what do you like, of course that's difficult because most people know what type of game they like because they've played other games before that they can use as reference. So instead I'll go the other way around and suggest addictive games if you think you would like certain mechanics/types of games.
Are you an engineer? Do you like Rube Goldberg machines? I have just the game for you. In Factorio you create your factory from scratch, first gather some coal and iron by hand, but before long you'll have a fully automated overly complicated factory.
Do you think you would like to instead build a base, starting with some colonists striving to make it through the winter but then growing into a huge settlement? If you like sci-fi RimWorld is about exactly that, with a small team of people who crash-land on a planet on the edge of the Galaxy and now need to build their base. If you prefer fantasy, Dwarf Fortress is a (more complicated) game about Tolkien types dwarves building their new home.
Do you have a controller and like to play games with it? Do you like being challenged? If so Dead Cells might be interesting. It's a game where each time you die you go back to the beginning, but the entire map has changed so it's never the same, and you'll unlock new things to explore different things and discover new paths.
Do you like Strategy? There are a series of games from Paradox Interactive that take place in different time periods, so choose what you prefer, they're all great and all have somewhat different mechanics (e.g. the game that's set on the middle ages has genetic traits so choosing who you marry is very important, not just because of what you'll inherit from them but also for their genetic traits for your sons). Going chronologically, if you want a game about the time of the Roman empire then Imperator: Rome; if you prefer a game about medieval times Crusader Kings (the current one is 3, but 2 is also very good); if you prefer colonization period Europa Universalis (EU 4 has an interesting mod where you can carry over your save game from CK2 into it to keep going from how the map looked there); If you prefer industrialization Victoria is a great game (current game is Victoria 3, although I haven't yet played it, most bad reviews usually compare it to Victoria 2, so I assume Victoria 2 is better but might be more difficult since it's quite old); if you prefer World War 2 then Hearts of Iron is an excellent game about grand strategy of war instead of how the games usually deal with this period, if you would prefer a more focused, i.e. control soldiers in a battlefield, I recommend the Company of Heroes (this is very different from the others here, but thought it would be worth mentioning because of the same time period but very different gameplay); If you prefer galaxy exploration then you might want to look into Stellaris.