Living pay to pay

Over the last 2 years I’m finding that no matter how hard I try I can’t build my savings up.

Paycheck comes in and it all goes to rent, bills and groceries. Any time I save a decent sum along comes a $600 car service or license renewal etc.

My question to this community is; what are some ways outside of your main 9-5 job that you earn some extra money for savings etc?