What are some open world games with tons of shit to unlock / collect ?

Saints Row had that standalone expansion wwith a hell theme. More of the same, pretty good.

Every Assasins game. Definitely Prototype Museum mod for Skyrim. It has slots to display every piece of unique loot in the game. And some quests to help you find them.

Also loads of jRPGs. Berseria, Xenoblade 2, Zelda

Just Cause 3

No I'm not, I have my government to do it for me.

Staying inside for months is unrealistic, at the very least you need to buy food every week or two, and some supplies or medicine.

anything from ubisoft

You and your daddy totalitarian government can fuck off back to Afghanistan where you belong.

If you liked just cause 2 you'll probably like just cause 3, just avoid 4 cause it's the hottest garbage imaginable
Divinity Original Sin 2 isn't exactly "open world" but it has a lot of shit to do plus it has sexy lizard ladies
Bethesda games are a given, they're pretty much all saturated with content of varying quality
Elite Dangerous isn't terrible if you're trying to pass a bunch of time

Assassin's Creed Odyssey and Assassin's Creed Origins both are full of collectibles, loot and repetitive tasks to kill your time, which is why I loved it. Decent story too if you're not hardcore AC lorefag.

Red Faction: Guerilla

I'm sure the open world is great but I just couldn't stand having my hand held for the first 15 hours.

Being afraid of germs for the rest of your life is unrealistic