The saints row series is pretty good. It was kind of a GTA knockoff but was much sillier and let you actually keep and upgrade/paint cars. It really lets you make the game yours. In… Number 3 or 4 the player gets movement abilities that make using a car actually slower so that really killed the vibe, but the ridiculousness was higher than ever so it kind of balanced. I’d recommend playing them in order or at least watching YouTube videos because the story is sort of linear.

Someone else said morrowind which really is the ultimate “do whatever you want” game. You’re basically never locked out of anything by not doing the main quest, and nearly every npc is killable, even essential ones (though the game will tell you if you do this so you can reload a save). There’s no vehicles really so I don’t know if that’s the vibe you’re going for, but it really is a blast if you can accept the painfully outdated graphics and mediocre combat system.

Valheim is a survival crafter exploration game that can be surprisingly cozy, and sailing around is fun. Also not the vibe I think you’re looking for but I love it so I shill it when I can.

I think saints row probably best matches what you’re looking for without being a sequel to a game you already mentioned.