Honestly, just take magnesium or fish oil or melatonin. Trying to chill out when my mind is active is a futile pursuit yet it has a straightforward solution :).
Clare de lune. I play it or a piano soundtrack from my favorite video game or movie and I focus on every note. By focusing on each note and fingering, it keeps me from thinking about other things, and I eventually slip off to sleep. This method also works to help dull pain if you have chronic pain! Clare de lune is defintely medicinal to me when I don't have the option for medicine. Hope this helps!
Just make up perfect life scenarios OR you can try keeping your eyes closed for a few minutes since that triggers your eyes and mind to relax OR watching your phone for a while