change components advice

Hi everyone, I want to upgrade 2 ancient PCs (mine + husband), they are both identical. I have around 800-900$ to upgrade them both. What we have: Motherboard: gigabyte h61m-ds2 Video card: gtx 650, 1GB, GDDR5 Processor: i3-3220 @3.30GHz RAM: 16GB @665 (2x8GB) Hard drives: 120GB HDD + 2TB...

my current specs: cpu: i5 3570 @3.40Ghz ram, : ddr3 hyperx fury 1886Mhz, Gpu: Geforce GTX 1050 ti OC edition ,psu: 350w I mainly play fortnite and some good grahics game like gta 5, forza horizon , pubg pc etc , but from sometime idk why the cpy goes up to 91 degree c* didnt do anything that...