Seeing as you already have that device, for £100 there is nothing you can do to get to GTAV, high, 1080px60.
You need a better CPU, i5, ryzen 5 at least, and associated mobo and memory
You need a better GPU, 1050ti/1060 class at least.
You may need a new PSU when you do this, and windows might expire due to the mobo change.
If you just do one of these then you'll not get the result that you want.