8 month old won’t sleep thrue the night! Help

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So my baby is 8 months and till this day she don’t sleep thrue the night she wakes up she cries and I try to soothe her or rock her and she pushes me so I gave her milk just 3-4 oz and when she finishes she falls asleep. 3-4 hours wakes up again and same only milk calms her and puts her to sleep. She eats a lot during the day too so is not like she’s hungry. I just don’t know what to do. I’m like a walking zombie cuz I’m up 4-5 times a night