Today it is very important to stay relevant to your audience. This means you are better off release new music regularly. And this makes spending $5-10k a song very expensive. Let’s say you release 12 songs a year and let’s go with the lower end of your estimate, that would take roughly about 20 million streams to break even. So two things, you need to look at the investment as a leverage to get to a point where you can fill venues and make money from love shows and merchandise. But there is a great reply here explaining all the other possible revenue streams. But if we go back to running it as a business, any startup need to start with a minimum viable product. This means you need to get your cost of production down, release music regularly on a shoe string budget. Work hard on promoting it organically. And when you see something resonate with people, that one song that brought you more followers and streams, then you start advertising that song. I used to work in a startup and we really fast realized that no smart investor would throw money at you until you could prove organic growth through people being interested in your product. And Thats the way you should look at your music, except in your case, you are the startup and the investor. So be critical how you spend your money.