ETA: No one here is criticizing you. I'm sorry you feel that way. These are experienced moms trying to help you get through the rough first year of your sons life. Be thankful you have a place like this. When mine were a year old? This wasn't around. I had to rely on friends and family, each had a different way. Just like here. You asked for help. People were giving you their experiences and that means help.
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A.,
I'm sorry. You really can't control your child's sleep patterns. I've said it before, the first year is tough. He's six months old, not six years. He's going through a growth spurt.
STOP trying new things. If you moved his bed time and he STILL gets up at 4AM? It didn't work. Get him a little more active in the evening so he is good and tired. Ensure he has a full belly, whether it be breast milk or oatmeal, clean diaper.
He doesn't know how to self-soothe yet. That takes time. Be patient. You don't need to constantly pick him up. However, you do need to show him you're there. It's OKAY to go in and pat him on the back, to sing to him softly, to BE there. You don't have to pick him up EVERY TIME. It doesn't make you a bad mama. Promise.
My 3rd son hated a crib. hated it. He was a year old when we took the mattress out and put it on the floor and he was a happy camper.
With 4 kids, I can tell you each of them were different. What worked for one, didn't work for the other. STOP trying new things. Learn about your son first. Six months is a growth spurt for many, not all. When he's a year old? Try working on your methods. But don't start one, doesn't work and skip to the next immediately. A routine takes 3 to 4 weeks to instill. Not one night.
None of my boys went to sleep before 10PM at 6 months. I know it sounds late, but they were tired at 10PM and slept until 6AM. That was the one thing that was the same for all of them. Were there times they were in bed before that? Yes.
Routine and structure really do help a child. They DO pick up on your stress. Even all these years later? Our routine is the same. Dinner, bath, brush hair/teeth, book, bed. My 17 year old? Yeah, he goes to bed at midnight during the summer. He's not six months old anymore.
You can't control his sleep patterns. Please know and understand that. Learn about your son first. You will get through this. I know it seems tough. It is hard. But you will get through it. ALIVE! :)