Sleep help

My 9 month old was sleeping through the night when he was about 3 months old (around June). We moved into our own place in July and he began sleeping in his crib, he was sleeping in a bassinet until then. Now sometime around the end of August or beginning of September he started waking up a couple hours after I put him in his crib. I'd put him back to sleep and put him in his crib, after a couple hours he'd wake up again. I'd put him back to sleep and put him in his crib and he wakes up as soon as I put him down (this happens a few times until he stays asleep). I think it's just sleep regression and he'll go back to sleeping through the night. We'll it's been months and he's still waking up. I put him down between 8-9 hi wakes up 2-3 before midnight. The second time he wakes up he wakes up as soon as e put him in his crib. The third time he wakes up I'm so tired I end up just putting him in bed with me and he sleeps all night. I know bed sharing isn't good but we both sleep well. But I want my bed back and my son needs to sleep on his own. I don't know what to do. I have a sound machine, humidifier, night light, it's a good temperature. Idk how to get him to stay asleep.