Need some guide from the Sifu's here on upgrading my PC.

My current PC super duper loud, annoying as heck...
Aurora R12
11th Gen Intel i7-11700F@2.5GHz
RAM 32GB
GPU : RTX3080

Would appreciate any recommendation/advice... no particular brand love, just looking for the best value for money.
(No monitor/Mouse/keyboard etc required)

Thinking : Budget pls dont exceed RM10k
CPU - AMD? Heard current AMB better value for money
MOBO - Totally no idea
GPU - 5080?
Casing - Fractal (or beQuiet)
RAM/SSD/PSU

I have a fractal casing 10 yrs ago, very quiet i like it alot (maybe cooling not so good and fan inside working overtime but I cant hear it anyway).

I have been checking places liek IdealTech (cause they have Fractal casing), i double check their GPU pricing, its around same as AllIT so thats kinda ok for me.

(Usage if anyone cares, browsing, some games like MMO, SpaceMarines2, RPG, etc. I upgrade my PC every ~4/5 yrs. I run a Samsung Odyssey G7 32" monitor)

Mucho Gracias!

the Aurora R12 is too loud, no choice will replace the system 

The GPU fan, its a far cry from my other system with Fractal casing.

Ya is a prebuilt, will pass it to my daughter for roblox or just use for CCTV etc.