You say "You've followed every advice", but what were you trying to achieve exactly? Is it that you can't fall asleep or that you're not productive in the morning, or something else?
Personally what worked best for me is just to wake up at 6am for 2 weeks without nap during the day.
Most people try to adjust their sleeping time to match their waking time, but they've got it backward. Set your wake up time and listen to your body for when it's sleepy, then go to sleep and wake up at the same time the following day.
The "have a kid" is just a way to force this behavior because they will wake up early every day over a long period of time.
Personally what worked best for me is just to wake up at 6am for 2 weeks without nap during the day.
Most people try to adjust their sleeping time to match their waking time, but they've got it backward. Set your wake up time and listen to your body for when it's sleepy, then go to sleep and wake up at the same time the following day.
The "have a kid" is just a way to force this behavior because they will wake up early every day over a long period of time.