Here's what used to work for me, if you do all of that at the same time you'd probably be fighting to stay awake after 10PM

-as few stimulants as possible, the optimal amount being exactly 0(no nicotine, no caffeine)

-no eating a few hours before sleep

-working out in the morning/afternoon(lifting and cardio)

-melatonin before sleep

-blue light glasses

-night mode on all my devices(warmer colors or even just devices turning off automatically)

-complete darkness and no distracting noises

-cold room, I've seen some people recommend 16°

-orgasms every evening

-mindful meditation before sleep

-no alcohol

-earplugs or relaxing binaural beats in comfortable earphones when trying to sleep and an eye mask

-the best bed/blankets/pillow you can buy

-a relaxing shower/bath

-a short walk in nature in the evening

I also used to take a bunch of supplements and very good food, and while it wasn't aimed at improving my sleep it probably improved my health/wellbeing which indirectly improved my sleep

If nothing works then indica weed, vaped or in edibles taken a few hours before going to bed lol