guess its a mainly gaming build or mixed use gaming/light productivity
everything looks good , just there is some things i would suggest going for power supply with atx 3.1 and pcie 5.1 standard such as ASRock Phantom Gaming PG-1300G 1300W ATX 3.1 or Asrock Taichi TC - one of them had useful protection
motherboard is fine but can be upgraded to asrock x870e taichi , same goes for 2nd SSD Kingston NV3 4 tb i guess its for storage but if it has 3 year warranty and the price difference between Kingston NV3 and Kingston Fury Renegade is like 30 usd id go for the Renegade since it comes with DRAM , 5 year warranty and higher TBW
the ram choice is good , just make sure its 6000mt/cl30 amd expo dual channel
also the rtx 5090 model you choose its one of the best , but asus tuf rtx 5090 would do the job pretty good aswell and i guess its like 200-300 usd cheaper
personally i dont like rgb but it comes down to preference
check youtube channel Pc Builder , he recently released ryzen 7 9800x3d build
Thanks for the tips man i appreciate it!