Help!

My guy is going to be 7 months on the 9th and we’re struggling quite badly with nap time/ bed time. I feel like I’ve tried everything. We’ve done baths, lavender diffuser, fan, sound machine, weighted sleep sac, pillow under the mattress. I’m at a loss. He refuses to go into his crib and just screams. He will fall asleep sitting up, but the moment I move him he screams. The doctor said to let him cry because I’ve tried everything else but I feel just awful after a couple minutes. Anyone have any other suggestions that worked for them. I am at a loss as to what to do to get him comfortable in his room to sleep. Also he still isn’t sleeping through the nights. Most nights he still wakes up every 1-2 hours