Cheers, love the sound of Divinity original sun 2 and just had a look and looks stunning. Could be the one.Outer Worlds for sure.
Made by Obsidian who made Fallout New Vegas. Great story and very funny. If you've played New Vegas you'll know what to expect. Not an open world as such but you visit very different worlds and choices absolutely matter.
Assassins Creed Odyssey is really good but it can be a bit too long and its pretty repetitive.
Divinity Original Sin 2 is fantastic. Thats more of a D&D high fantasy game very much in the Baldurs Gate mould and its turn-based combat. The learning curve is steep but the actual world, Voice acting, gameplay and quests are up there with the best ever. Check out the reviews, most people agree its the best RPG of all time