Gamedev is not easy work, especially today, and even more difficult being solo.
You could be an absolutely blessed programmer, but if your artwork is dogshit it will show. Or vice versa.
Godot engine is pretty user friendly, and is fully capable of 3D environments.
Unity would easily be the next step, and then UE4 / UE5 being the big daddy of game engines.
Doesn't matter what route you choose, the learning curve is very steep.
Best to start small, like mini games, not a full open world RPG with 16 times the detail and whatnot.
Not to mention asset creation, textures, models, weight painting, rigging, animation, et cetera.
Best be prepared when the research & development can of worms bursts open.