Two things that helped me in the past year:

• Avoiding caffeine after 10:00AM or so. I cut coffee completely, but I noticed positive effects by just drinking all caffeine before ~10:00AM.
• Sleep mask helped me a ton. Turns out we are super sensitive to the most minute amount of light.
• At least for me, not eating past ~6:00PM makes falling asleep way easier.
• Regular exercise (of any kind) allows you to fall sleep easier. Probably has to do with regulating hormones/biological subsystems.
• NO PHONE on bed. Bed is only for sleep and sex. In my opinion anyway.

Hope this helps!