This is way outside of my wheelhouse but all I can add is I would not spend 4k on your first bike. Spend 4k on a bike, by all means but I think you need to ride a certain type (ideally types) of bike for a reasonable amount of time to get an idea of what you actually like. I wouldn’t want to drop that much without being sure I’m getting the right thing.
IME being told what a bike rides like doesn’t compare to finding out what it feels like to you.
A better question to be asking yourself, IMO, at this stage is, “what sort of bike do I want to be riding?” If you can decide if you want something for all day xc epics, a trail bike that will do a bit of everything, a hard-core hardtail, full on DH rig etc. You don’t even need to know the terms, just think about how you want the bike to feel. That will point you in the right general direction.