I started the same way back with UDK both in skills and commercial ambitions:) I was trying to develop a MMO-like open world game. Developed many tech demos and experiments.Joined several Teams. Started a Team. Acquired 100s of Assets. That was 6 years ago. The MMO has yet to materialize. The lesson learned: as much work as you’re going to put into learning UE4, might as well start your development towards your game. I wish you the best. If you need someone to talk Game Dev with, you find me here or in discord.