Pacifier suggestions??

Help! My son will be 5 months old tomorrow. He will not go to sleep without a pacifier, but we can’t seem to find one that he likes. We were using the Nuk newborn silicone ones before he turned 3 months. Now he will TOLERATE the Nuk 0-6 month ones, but he doesn’t really like it. He won’t keep it in his mouth unless we are holding it in for him. We have tried so many others - Avent soothie, Chicco natural fit, Avent freeflow, and Playtex. I’m at a loss on what to do. He refuses to fall asleep without a pacifier or using my breast as a pacifier. Suggestions?