To get my fill?

Hi there!
I just wonder what this expression means. I listened to it from the song “Don’t stop believing” by Journey. Here you are the complete verse:

Working hard to get my fill,
everybody wants a thrill
Payin’ anything to roll the dice,
just one more time
Some will win, some will lose
Some were born to sing the blues
Oh, the movie never ends
It goes on and on and on and on.

On top of all this, I’d like you to explain, if possible, a little bit about what the song means.
I’d really appreciate your effort and time for this.

Thanks in advance!

‘Get my fill’ = get as much as I want / as much as I can.