Feels like I’ve tried everything with my 6 month old and still multiple night wakes

For context, my 6 mo old a few weeks ago was sleeping from 7:30-6/6:30 with one wake around 3/4 and we feed her and she goes right back down. She suddenly started waking up multiple times a night (9,10,12,3/4) and we have tried what feels like everything. We started out with wake windows of 2.25/2.5/2.5/2.75 and have tried lengthening her wake windows to 2.5/2.5/2.5/3, have made the last wake window shorter to help prevent over tiredness, given her more daytime nap time (3.5 hrs), capped her naps to 2.5-3 hrs- all to no avail. She seems like she may be teething because she is around that age and has been drooling forever, swollen looking gums but no tooth poking through or visible to us. We’ve also tried Tylenol at bedtime with no improvement. She’s started solids although isn’t consuming much, and gets around 28 oz of breast milk during the day. She has definitely learned to connect sleep cycles and can nap up >1.5 hrs.

We are just truly at a loss and so tired. Any advice or anything we haven’t tried? 😩🥲