How to change 4 month olds sleeping schedule?

Ever since Christmas my baby sleep is messed up which is resulting in one tired momma!

Baby now doesn’t go to bed right away, wakes up every 20-30 minutes crying and eats each time. Finally falls asleep for the night around 10:30pm-11:30pm, obviously wakes up for feeds during the night, and is up for the day between 10:30am-12pm.

Before Christmas bedtime was 9-9:30pm, but i found 9 way too late for bedtime. So I would like to change it to 7-8pm!

How can I do this? Any tips? I’m struggling here! With me going back to work soon I’m really nervous it’s not going to change 😭