As if i3 10100 couldn't run games at way over 60 fps.
And your recommendation is RX 590? Is this a joke? Even RX 580 was known to guzzle watts like no tomorrow, as much as whole GTX 1080 did. RX 590 might be in 1080 Ti territory and it's still the worst Polaris card. Not to mention that it's old as fuck nowadays and doesn't support even rather old VP9 decoding, which YT uses. Also RTX 3050 is terrible value card. RX 6600 slays it at everything and is cheaper, buy it instead.
That i3 performs basically the same as 3900X. That's not a weak chip at all for gaming. Also 4C/8T CPUs are still perfectly enough for gaming, also Skylake was rebranded up until Comet Laike R, so 6700 is basically the same i3 10100, there are no architectural differences at all. Sure i3 10100 has slightly higher clocks (200 MHz), but i7 6700 as 2MB more cache, that still works out better for i7 and you can also crank PL value and basically always run it at maximum boost clocks if you want. Considering how well that i3 handled RTX 2080 Ti, i7 can easily handle it too. RTX 2080 Ti is basically the same as RTX 3070 and you might still need to go further to actually find a bottleneck from CPU side. I'm telling you that i7 is still great.
Here are the tests of that i3:
You need RTX 3080 to finally see small differences, that are still not explained by core or thread count, only by differences in cache and perhaps higher boost on i7 or i5. OP is still more limited by budget and power supply than by his i7. He basically needs RTX 3080 tier card to finally see some shortcomings of his CPU. Considering 500 watt PSU, the most I could recommend for him safely with some safety margin is RTX 3060 Ti, RTX 2080 or RX 6700 XT and of course the fastest out of them is 6700 XT, not to mention, it has most vRAM. How it fares value vise I have no idea as I have never looked at prices of those cards, but if he wants something cheaper there are some great options like RX 6600.
It's exactly same arch tho, only Comet Lake got shaved CPU die and heightened IHS for better thermals, but that's it.