Trying to Stop Cosleeping

My son was in the NICU for a month so he’s much more attached and wants skin to skin a lot more than usual so we co-sleep but now that he is 3 months old he needs to start at least sleeping in the bassinet. He still sometimes has one bottle throughout the night that’s why I’m not ready to put him in his crib right now. Do you have any tips on stopping co-sleeping? What have you tried? Even what didn’t work? Thanks so much!