Hi Royd,
Not an expert by no means but looking at the Novabench marks, both the CPU and GPU need upgrading to get to a mid level machine, currently it is equivalent to a budget laptop.
Saying that you have used an AM4 mobo so that allows you to upgrade to a Ryzen CPU, for me I would start that way as this will be cheaper than the outlay for a new GPU.
Alternatively get him playing Counter strike, it will run that well
Mine isn't much better!
https://novabench.com/view/1655151Cali