Girls, I have a question... My baby is almost three months old and use…

Girls, I have a question... My baby is almost three months old and used to sleep in a crib with closed arms. Now I'm afraid to put him down because he moves a lot and opens it already. Without a crib, it's very difficult to put him to sleep, he struggles with sleep until the last moment and doesn't sleep, or sleeps but wakes himself up with his hands and quickly wakes up. What should I do? How would you advise putting the baby to sleep? I've been so exhausted from lack of sleep for days, an hour will sleep and wake up, and this all night…