I would take a step back and ask yourself a few questions. 3840x2160 at high settings will absolutely avoid (for the most part) a CPU bottleneck since the GPU will do most of the work. If you plan to play at that resolution with modern day titles, depending on the genre or title, will determine what upgrade path you take based on how demanding those games are.
I have an RTX 2080 (on ebay right now for 400.00) and just upgraded to an RTX 3090.
If you upgrade to a gpu in a prior year (maybe 2020 and newer), Nvidia or AMD, you'll be happy as long as the games you're playing aren't too demanding. However keep in mind, you're playing games or wanting to at a very high resolution. Heck, I only game (I play First person shooters) at 1440p myself and I'm rocking an RTX 3090.
You also want to make sure you're a little current on your memory and CPU. Even though that high of a resolution won't need an extremely fast CPU, you do want to pair your GPU with a CPU that will allow it to breath. Worst thing you can do is upgrade your GPU, and the rest of the system holds it back from its true potential. For example I was rocking an i5 10600k and just upgraded to a i7 11700k to accommodate the RTX 3090 just to make sure I'm good to go moving forward.
Research, research, research. I spend countless hours reading articles and guides before I drop $500+ or any money for that matter on my PC. Check out the games you currently play and want to play. See how their performance is at different resolutions. Maybe your games aren't that demanding and you can get away with a used GPU from the 2000 series or similar AMD 2020 released GPU. Save yourself some money. Or go all out and max that 500-600 bucks on a new GPU that might be a middle tier card for 2022. The options given in the first post are fantastic options.
It's all about what works best for your wallet, running your games, and what you plan to do with the system moving forward.
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