Some tips that might be helpful:
Reduce the amount of blue light (tablets, phones) your eyes get exposed to in the evening.
Expose your eyes to enough bright daylight. Get outside for at least… hm, IIRC at least a half hour. But I’m sure more is better.
Exercise outside, e.g. cycling for an hour.
Take any medication? Read about the side effects.
Sleeping problems may be one of the symptoms of a disease.
Melatonin in a very small amount is helping me falling asleep (0.3 mg per tablet). I have read that a low dosis is key, not a high one. Though I would not exclude a welcome placebo effect.
If you consider it, please search the internet and inform yourself about the stuff. After all, it is a hormone.
L-theanine which I started taking recently hoping for a different effect, has gotten me a sleep that is profoundly refreshing. I am getting a real firm sleep, if you get my drift. I haven’t slept like that since I was a child, I think. I have no idea how long this will last. I am sceptical that the effect will wear off after a while, and that I can not get a good sleep without it anymore. Just like sleeping pills - which should not be taking longer than two weeks. Besides, imo those infamous sleeping pills are not refreshing at all: as if someone has knocked me out; a lack of consiousness, a state of non existing, instead of being asleep.