Please only state ideas that have personally helped you, in your daily experience, not a hypothetical answer from a website, that might be helpful.
I have had major problems with sleep at least since I was a teenager, and extraordinary sleeping hours. I feel that if allowed to, I could probably go to sleep one hour later every day, until I was back to normal.
I have read dozens of articles on the Internet, and talked to family and friends, I have tried dozens of suggestions. Nothing has worked for me. I feel that perhaps one or two ideas from someone, that are attestable, that actually worked in their personal life experience, might work.
Note: For reference I can state some tips for the converse, how to stay up longer, to indicate the kind of advice I'm looking for: eat oranges, drink protein powder, go out into the light and walk around, take a strategically timed nap halfway between waking up and desired bedtime.
Note 2: I do not want to take sleeping pills or medications, although supplements would be potentially acceptable.
Note 3: If you are aware of something that definitely makes it harder for you to get to sleep, to avoid, that could be potentially relevant and interesting.
Note 4: This is a good summary of quality and useful, but generic, advice:
Note 5: Any mental or physical activities that are attestably good at causing rapid exhaustion would be worth mentioning.