It sounds like you have already started with some sleep hygiene. I hope there's something more here that might appeal to you.
1) Magnesium is helpful to some for relaxing into sleep. There are 7 or 8 kinds of magnesium supplements. 400 mg is enough usually. The best two that are most suggested are mag citrate and mag glycerinate. Won't effect the bowels in most people. It's best on an empty stomach about an hour before bedtime.
2) you probably already know about no computer or tv an hour or two before sleep.
3) If you use caffeine, try having it only in the am. No chocolate in the evening either, has stimulant in it.
4) If you eat dairy, then the small glass of warmed milk trick in the evening is a help to some. It's the calcium in it that aids relaxation.
5) some people use melatonin. The dose does not need to be as strong as many people take.. A low dose will work even better and without the possible side effect of creating strange dreams which happens for some.
6) a bit of yoga
7) meditation, even 5-10 minutes. What your therapist suggested about putting aside the day's worries is kind of a way of meditating if you've never tried it. except an hour seems a fairly long time to me for engaging with it. Was journaling a page or two suggested?
8) warm bath with Epsom salts before bed, which is magnesium.
9) essential oils such as lavender, clary sage, Passion flower, spikenard. Can lightly rub 2-4 drops on bottom of feet or put a drop or two of lavender on a tissue and put in your pillowcase or on the night table near you. The lavender might help ease a tension headache. You can dilute an essential oil in a 1/2 to 1 tsp of almond or coconut oil first before applying to skin. Olive oil will work if that's what you have.
10) Completely dark room
11) don't eat 2-3 hours before bedtime.
12) lots of targeted sleep assist music you can google if you'd like to try that kind of assist.
13) you can massage your feet after you get in bed for a few minutes...acupressure points.
14) some people sleep better in a cooler room.
15) no sugar of any kind for about 4-6 hours before intended sleep time
16) some kind of exercise, like walking, during the day if possible for 15 minutes or so.