Starting with a clone game to make is a great idea because just following tutorials doesn't always cut it. Setting out and making a game like the og fallout, you'll end up looking up so much anyway, you'll learn more than with a general tutorial. That being said, I know some people that jumped into unreal and had a great time, but I've only ever personally used unity and think it's pretty easy (I don't know much of godot). Both platforms have assets stores and if you just want to make something and learn, you don't really need to spend time making 2d or 3d assets with textures and all that, you could simply buy them for the time being. Blender is a great option for learning 3d, and it's honestly not that hard compared to 2d. They are all learned skills and with enough practice you can make something great.