Settling baby to sleep.

Beebee

5 weeks and she should be self soothed to sleep. having difficulty putting her to sleep in the evening. She'll hang on to boob even though she finished nursing and will wake once it's out from her mouth. She's a bit colicky still but she gets drops and poops, gets changed be fed in a darker, quiet room and it'll take at least 3 hours for her to fall asleep. What do I do?