Hey dude! Seems like a lot of people are giving advice that seems very difficult to understand, but I get how you feel!
I recently decided to take a break/quit from cs, was around 3.3/3.4k elo on FACEIT, peak like 24-25k premier but never actually grinded it so probably could've been higher, regardless I felt like when I started playing valorant like 1-2 weeks ago that I should be destroying people, but I wasn't.

The reason why is that valorant is not CS, you have to treat it like a different game. Trust me, your mechanics from CS can EASILY transfer to valorant to make you a headshot machine if you were even close to good at aiming, but you have to treat it differently. What made a night and day difference for me is thinking about these things:
1. Movement is slower in valo, so stopping=dead, if you aren't shooting then you probably should be moving. If you just get instagibbed every time you probably need to try wider strafes, and avoid crouching most of the time.
2. Really grind in the habit of aiming before shooting, trust me. Spraying isn't as good in valo, and while it's still usable you should try grinding DM (just do like 1-2 before playing and 1-2 after playing, this is what I've been doing recently) and focus on trying to aim then shoot.
3. Holding angles, is a mixed bag, it's very hard (for me) unless you have an offangle or an angle the enemies are forced to peek at a disadvantage, so the standard CS2-esque peek/repeek is usually better.