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really so I don't know if that's the vibe you're going for, but it really is a blast if you can accept the painfully outdated graphics and mediocre combat system.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.

Cyberpunk is actually a damn decent game now, and the world has SO MUCH crammed into it you can just wander and do whatever activity you run into for ages without getting bored. Even the smallest side story has lore that illustrates a tiny piece of night city and I find that really cool.

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

Anything Elder Scrolls kept me busy much longer than the main story, most notably Morrowind. Also, I replayed GTA IV (+ stories) last week, was heaps of fun, especially compared to GTA V which I played a few months back. Read Dead Redemption 2 is a good one for this list as well, I enjoyed that one immensely, but I mainly focused on the main quest during that run-through, so this is a good reminder to myself to pick this up again soon (sadly I fell back into the pull of Satisfactory so it might be some weeks/months/... before I get to it)

Red Dead 2 is a masterpiece of this genre

I just recently got Spider-Man on sale and I've not once used fast travel except in the tutorial because it's too much fun swinging around the city. And there's like 50 types of collectibles/ side missions to do while you're fucking around.

Also you should definitely try Grand theft Auto v if you had that much fun in San Andreas

I dunno how well crafting/building games fit what you’re looking for, but I can jump into Valheim and just screw around for hours collecting and making stuff. The world isn’t populated like a grand theft auto, but it’s fun to just explore and mess around/build stuff in!