How to get 4 month old to sleep on own…

My babes is almost 4 months in a few weeks. He does great at self soothing when he wakes up in the middle of the night, thumb sucking and pulling/rubbing hair/head. He sleeps for a good 7-8 hours and if he does wake up in between he does the above. After the 7-8 hours he’s hungry and I feed. But