I'm a chronic insomniac, too, since my teen years. I know that alcohol made things worse, but in recovery, I'm still an insomniac.
Melatonin helps me get to sleep, but I routinely wake up after an hour. I watch boring TV or read. There are lots of great guided meditations to help you sleep, which you can google. Above all, I've found that the harder I try to get to sleep, the less chance there is of it happening.