I understand, you want a normal life with GF, etc.; therefore,
you should take the Youtube way.
I know you are not Anna Sentina or Marta Altesa (SHUT UP, WUTP!), which means that no youtube channel could provide you with enough money, but...
You have friends at TB, and those "friends" like WUTP can help you to set up the "Right way" your youtube channel.
You will be recording your the bass guitar noodling for your youtube channel.
And you will have quite a few subscribers while playing the bass guitar.
Here is my "idea".
Your youtube channel will be (or could be called) "A bedroom bass player", and...
....
....
and a "mean" GF who hates your bass playing".
Here is my plot.
You situate yourself comfortably on the bed in front of your "youtube" camera and start playing something (it does not matter what) on the bass, and suddenly, your GF shows up and starts arguing with you in front of the camera
like, "Jay, you completely forgot about me. Can't you kiss me?, etc...".
You can extrapolate my idea further...
Next episode.
You start playing the bass in front of the camera while your GF is trying some new clothes or swimsuits in the background...
In short.
Your youtube channel provides enough money for you to live a normal life with your GF.