You are only required to work 38 hours per week.
Anything above that is overtime.
People leave a job for many reasons which may include but not limited to.
Family commitments, better pay, better conditions, better work environment, better prospects of advancement, don't have to deal with ****ers etc etc.
In your case working on weekends & not being able to attend markets & side sales would be a good thing, as you would be paid penalty rates for weekend work & not attending sales & markets would mean you would be spending less.
Because after all you are saving for a deposit on a house of your own, aren't you?
https://www.fairwork.gov.au/tools-an...hours#overview