I mean you’ve already got it now, 4090 is kind of a waste and very poor value at 1440p, it’s a 4k card. It will do great though.
Get a 13700k or 7700x
PSU I’d get a solid 1200/1300w gold unit EVGA/Corsair/Superflower/Seasonic
O11 is a horrible case for a 4090, you want a wide case with space...