I had 1 part time job that I've had since february. I only fill in when someone is ill or on holiday, or if the shop needs extra staff for a busy time. Because of that, I've worked less than 10 shifts in 6 months. I decided that I needed another job on top.
Last week, I started waitressing at a local cafe and absolutely love it! I have regular sundays plus extra time if/when they need me (so I've done 5 shifts in 10 days). The pay is better, I get tips (which my other shop/cafe doesn't do), the hours are less, and the staff are more my age (all students besides the owner and cook). So far, I still haven't heard anything from my first boss about working any extra shifs over summer so currently, I'm keeping that job until after summer. Then, if it starts to clash, I'll quit the first one and keep my other one, where I'm much happier.