for adice a better category would be eg.
I’am not sure whether its usefully to spend to much money into this system. The price of “used” components are currently also not good and buy new parts for these board is may be also to expensive and not usefull ( also have windows 11 in mind ). May be you find a better cheap GPU ( the 970 have these 3Gig issue ) ( may be a used 1080… ) . But also the DDR3 can be a factor which limits the performance, in special with coming dx12 . More RAM is okay, but give you may be not this-kind of more fps you expect.
But let us see more recommendations… sometime comes very intressting ideas on top 