You can’t solve a problem without analyzing the causes of a problem. Why can’t you sleep? What keeps you awake?
Totally agree with this.
Additionally, I have had really bad problems with insomnia in the past which I have treated with herbal supplements and teas, so I will give some recommendations based on my experiences. I didn't like melatonin, personally, or hops, but they work for some people. Valerian is my personal favourite. I never needed the recommended nighttime dosage; it made me feel hungover the next day. I take around 60 mg (two tablets for "daytime anxiety") if needed for insomnia. (The point you can take here is, if something makes you feel bad in the morning, try a lower dosage, usually marketed towards "daytime anxiety") Lavender tea was far too much for me, also. I just drastically lowered the amount I was including in my teas, and it was better.
As for teas, it can be difficult to measure the dosage you're getting. I steep them for a very long time (around 3-4h) in a thermos.
You can find pre-blended teabags which makes it faster and easier, and usually they have good flavours! Look for ingredients like passionflower, lime flowers, valerian, chamomile, hops, lavender, lemonbalm.
Be aware of side effects, and don't take too much for too long. For example, when taking valerian, only do it for six weeks at a time, then take something else if needed for two weeks, after that you can take valerian again for up to six weeks.
You can find all this information by Googling the herbs, "how to use ... for insomnia", "benefits and side effects of ..."
Some things aren't good for everyone, so do your research, try different things and don't take any one thing for too long! Best of luck