No offence but we're trying to help you here. If you think everything's fine, our advices might not be what you need. We've all been there and done that to learn that every component in a system has some weight with regards to performance and at the end of the day, our wallets. There are numerous documented sites that show a cheap/no name/generic PSU with enough wattage to drive a system for years on end, conked out in a space of days or months.
Along those lines, it's been documented how the RTX3000 series and AMD's lineups of GPU have transient loads which tend to strain the PSU beyond it's spec. It's with this(discovery) in mind whereby it's now commonplace to recommend a much higher wattage unit(that's reliably built) to power any system with a concurrent GPU.
Apart from your expensive paperweight PSU, you might have a corrupt OS, a corruption in your GPU driver or even your platform might be pending a BIOS update which could all(individually and/or cumulatively) be the root cause of your abysmal FPS with a mid range RTX 3000 series GPU strapped to a lackluster platform(for 2022).
As for what you're dealing with, we're trying to troubleshoot your system. There's no magic bullet to solve any and/or all issues, it's all a process of elimination to find what might be a solution to your problem.