Op, I have been suffering from sleep issues for years, what I found it works:

1. Sleep/Awake (roughtly) at the same time every day
2. No alcohol
3. No Caffeine after 15:00
4. Weed (if you don’t want/can getting high, CBD is legal almost everywhere, but tbh CBD does nothing for me
5. Melotonin (otc, helps sleep, not adictive)
6. Sports