Baby Sleep

My baby doesn't sleep. I mean, he sleeps maybe 3 hours. It takes 3/4 hours st night to get him to sleep. He'll sleep 2-3 hours. Then he's up. WTF. What are the most extensive ways to get ANY sleep? We're two days from hiring someone to sit with him at night because we just can't anymore. I tried sleep training, I tried cio, I tried using a flexible schedule I tried using a rigid schedule. I've changed formulas I've changed the way we put him to sleep I've changed the temperature in his room. I've tried the pack and play, the crib, our bed. He doesn't sleep. And he doesn't even seem to notice. He used to sleep, I think 😭