Honestly your best of picking up a Quest 2. If first person shooters are the preference, then there's a decent selection of native titles to the Q2 that you can play without the need of your PC. The graphics card you have is rather dated, and if you could strip the PCVR versions of those games down to run on the PC, it's likely they'd look no better if they'd run at all. The chip you have is manageable, but you'd want to look at upgrading graphics and more than likely the ram. Recommended specs are i'll leave to somebody else, we all have differing opinions and budgets.
While native Q2 releases of the mainstay VR fps like Pavlov, Contractors, Onward, Saints and Sinners, and maybe Population One don't compare to the games graphically on the PC, it's a good option to have while you probably look at upgrading the PC. A good many games if bought on the Oculus store allow cross buy, so you get the PC version too. People more versed in the platform can guide you with that.
The Q2 won't go anywhere, it'll be useable on the PC with a little extra spend and is probably a better option than the Rift S going forward.
Ask more questions if you're unsure.