How do you stop breastfeeding?

My baby is 22 days old and I’ve breastfed since birth. I also introduced formula around day 6 as I couldn’t cluster feed as much as she needed.

She is already having 4ounces every 3-4 hours. But she also has boob milk throughout the day.

She has started to spit my boob out and try’s to find it straight away.. I feel Like she’s not satisfied and maybe it’s time to stop?

She loves comfort from breast feeding and she falls asleep easily on my boob.

Only problem is, even with 4oz she still wants milk after! I’m feeling like I’m over feeding her and without the boob milk she won’t have comfort after?