TTRPG System

Hello! I'm thinking of trying to make a TTRPG system. I randomly got the inspiration to run a game about like, cool sick exo-suit people helping out/doing jobs. But then I remembered that I'm already in FOUR campaigns and am going to be running an additional three (Though getting a job might affect that), and I don't really have the exact inspiration to learn another RPG system (Just learnt M&M). 
So I have come to the smart decision of making a whole stand alone system. Have I ever made a RPG system before? No. Do I know where to start? I'll get back to you. 
Anyways, I'll be posting the edits and chapters of it as I make them, so if you're reading this and got some free time, lemme know what you think!