Sleep advice needed

Hello my daughter went from sleeping from 7pm-3am (she would wake herself up every morning at this time) have a bottle and then go back to bed till 7am. That was obviously amazing as she is only 3 months old. But we had to change her formula as she is badly allergic to cows milk and soy. Which we knew and she was on lactose free formula but was told to switch to goats milk. Since switching she is so much happier but now won’t sleep for more than 3 hour lots and I dont mind the feeds during the night but just would love to get back to what we had. Any one have any advice on how to make it more filling?