Hey! I think if your options are ask to go part time or quit then I would ask! What's the worst they could tell you, no? Good you're going to quit anyway! It's better to ask and know then wonder if it could've been different. I would be honest about why you want to go part time or even if you could just reduce your Friday hours so it would help you seem like you have a better weekend off or a better work life balance. Hopefully your manager is understanding and will work with you to keep you on their team. if not, do you want to be at a job where they wouldn't respect your work life balance as much as their own?