Sleep tips please!!

I’m so exhausted!!! My little one is almost 7 months and her sleep was GREAT up until about a month ago. She seems to be waking up every 2 hours at night. The longest stretch she will have is 3 hours and before that she was sleeping through the night. So as mentioned I’m feeling particularly wrecked. When she wakes it seems like she just wants comfort because I go to breast feed her and she pretty much falls back asleep straight away and I put her in her cot. Around 4am though it’s hard to get her back to sleep so I end up putting her in the bed with me until about 6am-7am Her bedtime atm is pretty late! Around 9:30pm. I recently tried to transition her from 4 nap and day to 3 nap a day and drop the last night and get her to bed by 7pm but she just kept waking up multiple time between 7pm-11pm. He days naps aren’t good either. She will go down easily enough (breastfed to sleep) but she will only sleep about 30mins. I’m rambling but any advice/tips would help please!!! I need either longer day naps so I can catch up on rest or longer night sleep 😅