Girls, advise me what to do?

Girls, advise me what to do? The baby is about to turn 5 months old, and it needs to be long and tortuously settled to sleep. When I put her to sleep, she often struggles and wakes up because of that, and then she sleeps for only 20 minutes and then falls asleep again. As a result, we don't get enough rest and constantly have tantrums. This has been going on for a long time now.