Oohhh boy this is my favorite newbie advice to give.
I'm a horrible sleeper in general even in times of calm. So when the EA started before H was willing to admit it I had already stopped sleeping. Once I kicked him out of the bed I was sleeping maybe 3 hours broken like you. So the meditation audio is great. But it's just one piece of a bunch.
One of the biggest things is our brains crave predictability. Even more so in times of stress so you need a bed time and a bed time routine. Let's say you pick a 10:30pm bed time you have to be in bed and done with your routine by that time every night. The routine I strongly recommend is a warm shower with a lavender soap about an hour before bed. There are lavender soaps out there that aren't so feminine. A good one is Dr. Bronner's. I don't know what the availability is for you where you are. But there are others. It may take some research.
After your shower no TV, phone, tablet, kindle what have you. Make a nice cup of tea. But not like a cuppa. A nice herbal tea no caffeine. Chamomile if you don't mind it. I strongly suggest ordering a weighted blanket if you don't have one. I also suggest a diffusor for essential oils. Put it in the bedroom. There are a million sleepy time blends. Just find one that you like. Start that when you make your tea so the room is already filled with the scent when you lay down.
You can add in or take out any steps as you like. It's your routine. But definitely stay away from screens at least 30 min before bed and do that routine consistently at the same time every day for a few weeks. I promise sleep with come easier. My last suggestion would be CBD oil in tincture form. High dose. Like 700mg or more. Take that about an hour before bed too.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712