I suggest you to use Unity. It’s popular game engine that can make browser (html5) games, both 2D and 3D. Not sure if you can do mmorpgs without super skills but Rust was made in unity and its multiplayer game. When I was messing in it I was trying to code something similar to Rust but singleplayer and I followed this RPG tutorial, it’s good for beginners gamedevs and programmers. I eventually stopped making my game, because although the process of making games was interesting, I just felt like no one ever will play my game so. But! It’s great feeling when you’re creating neat project with neat, optimized code.