Work a real job and live frugally putting your savings towards your dream job. That's how most startups get launched.

Well, find an agent that likes what you do and willing to bet some money on you... like... wait! A record company!

Work harder and figure out who the gatekeepers are, then get on reddit and/or youtube. Grow your subscribers to 10k and that should be enough to get 10% to back you with money.

I am not saying it is easy, but given that you have spent years learning to play, you should be able to spend a couple months to get noticed.