[mothered]

Force yourself into going bed without your phone and try falling asleep, it will be horrible for a few days but after that you will start falling asleep way easier while getting much better sleep.
Also don't take any caffein in the afternoon and nicotine 2-3hrs before bedtime, and taking some melatonin 1hr before desired bedtime can help too.

I have also been trough months of suffering because of the same thing, hope my advice was helpful, it all comes down to adjusting your daily & overall health habits.

Sound advice.