I heard a heartwarming story recently from Brandon Sanderson. He was saying in his writing class that a full-time writer has an advantage, but don't worry if you can't afford being a full-time writer! If you only write for 4 hours a week, after a year you would have a novel. You have even less time? It would take 2 years but you gonna have your novel eventually. The important thing is consistency...

As an outsider it's not my place to give you any advice. And I know it's not gonna be easy. But I want to encourage you to pursuit what you like to do! It maybe take more time but eventually it's achievable...