Uch this is so hard i was at the same stage as you a few weeks ago and felt like an actual zombie things I've tried that have helped...(and you have orb ably tried but thought I'd say anyway)
Baby lavender lotion after bath
White noise/pink noise etc
Put the side up on the snuzpod or whatever you have them sleeping in if you already do this try it with the side down
Get fleece onsie for bed - if you have that try one without feet some babies like their feet to be free but most don't
Bigger sleeping bag - if you don't use one then try that
Humidifier
Moving baby into own room if you have the space
Nightlight if you havent got one if you have try without it
Dummy if you use one
Putting the baby to bed in their cot with their feet towards you if you do it with their head by you at the moment
Try a formula bottle before bed
Get baby on the solids if ready
Long walk before bedtime
actually say to your baby' it's time to sleep now, so you need to close your eyes and rest and mummy will sleep next to you also'
Glow stars on the ceiling or baby mobile
Check baby isn't too hot or too cold or is there is a draft - use a room thermometer
Make sure they are fully winded
Put babies pjs and bedding on your bare chest for 30 minutes before bedtime to make sure your scent on them
Go online and get a warming hand. It's slightly warm and you put it on your baby and they think it's their parents hand