How do you get a newborn to sleep?

Having a bath before bed helped mine when she was a newborn! (Idk if you’ve already tried this or not so thought I’d suggest) I hope that gets better. I know how hard that can be. My daughter had a phase like that.

Just want to start by saying it is nothing you are doing / not doing.
Baby thinks they are a part of you hence why they instantly wake when pit down. It is totally normal for them to want to be held all the time - but obviously hard for us as we need to sleep at some point!
If you can, maybe take turns/ shifts with your partner / anyone who is with you so one tries to keep the baby settled while the other sleeps (this may be trickier for a Breastfed baby tho). It’s not a long term solution but may help in the first week or so.
Have you tried swaddling for bedtime? Helps prevent startle reflex which often wakes newborns.
Make sure rooms are bright and that baby gets daylight (even if just sat by window) then darken and quieten everything at night time.
When it’s hard remember, everything is a season and will pass. You’re doing great x