Oh Mitsuki. Treading the extremely well worn story beats of every band manga before you: sell out, or struggle.
Suck it up big girl. You’ve got the talent, but talent alone won’t get you ahead in this business. You either quit this band and try finding some other musicians that match your vibe, go solo, or continue on until you have enough personal exposure, experience, and resources to do those other things later. That’s life. And you are in the early stages yet.
And if you think your super supportive girlfriend, family, and friends are going to think less of you for doing those things the. You really haven’t been paying attention! 😅