Still, I do believe you should save up a bit of money and get yourself a Ryzen for that GTX, even a Ryzen 3 should suffice. You can probably find affordable computer components now that the sales have gone down a bit, too, so upgrading the main components shouldn't be too costly. You don't need top of the list components to play, either, unless you want to run everything in ultra graphics at 2K+ resolution which I doubt is your goal.
The SSD may help with textures and such, as well as the RAM may help loading them. Aside from that, if the processor bottlenecks, it doesn't matter how fast your GTX and your memory components are, stuff will run slow regardless at least until it loads all or most textures.
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you should get a RAM upgrade 100%
4GB just doesnt cut it for a lot of modern PCs unless you're doing office work
just make sure you either get RAM that matches the clock speed of the other stick, or just get out an 8gb stick of ram as it should be fine for most games if thats what youre planning on doing, DDR4 would be the best (note: if your current stick of ram isnt DDR4 get one that matches, otherwise it wont be as effective)
Never recommend single sticks, always recommend dual channel. If he wants 8GB he should either buy a second RAM stick that is the same specs as his current, or buy two brand new sticks of 4GB each.
The idea is to utilize the dual channel function of the motherboard, that increases loading speeds as the RAM function isn't performed by one single stick but 2 in unison.