There's a weird 'blogging is good' mentality around here but the truth is writing a decent blog post takes a lot of time and gives very little return.
Highlighting people who unexpectedly rose to fame is no use, thats just survivor bias, for every Mike Posner there's millions of musicians who spend years trying to make it with no success.
'Write content for your future fans' is also survivor bias advice. In the attention economy most blogs will just be ignored forever.
So here's my advice: Its ok to give up. I think 'never give up' is terrible advice. People can waste years of their lives due to 'never give up'. There is wisdom in knowing when to give up and spend your time on something else. For most people, blogging is a waste of time and they'd be better off going for a nice walk.