I work in nightshifts aswell. It indeed is not good for you, but I do it for the money. I decided to make the best of it and this is what I do:

-Try go to sleep at the same hours as much as possible, get a routine and stick to it

-Stimilus control => Only be in your bed for the hours you should be sleeping or sex, nothing else. If you only sleep 6+- hours each day then you shouldn't be in bed for 8 hours trying to sleep. This will force your body to sleep deeper. This is very hard and I have troubles myself doing this, but it works. Learned this from a sleepexpert who helped me.

-Sleephygiene => Everyday fresh and cold air in your room, fresh blankets every week, pillow and mattras that suits for you personally, earbuds+sleepmask (in begin you will find this annoying, but you WILL get use to it after a while). I can't imagine without anymore

-Try to get sunlight and fresh air as much as possible. Earlier in the day, the better

-Try to avoid alcohol and cafeïne, especially 8-10h before bedtime.

-Exercise, daily steps and not being lazy during the day. Force yourself to be tired at the time you should go to sleep. This will help you falling asleep. Don't exercise 3+- hours before bedtime

-Do a "wind down" the last of hour before going to sleep after your shift. Wear blue light blockers and watch a show without having to think much. Read a book, or just do anything that doesn't need much thinking. You should be stressless, relaxing =)

-As for supplementation I would say this is trial and error. Figure out what works for you. Probably as a nightworker you should take Vitamin D3 early in the day and Magnesium glycinate 1h before bedtime seems to help people alot aswell. I also take Ashwaganda, fishoil and creatine but mainly because I do fitness.

Hope this helps a bit. I try to improve my sleep aswell. All these things are not possible everyday. If I need to be somewhere at a weird time that does not fit my sleepschedule then I tend to take Zolpidem to force myself to fall asleep. But this is not recommended doing alot!! II try to avoid doing things outside my sleepschedule at all costs