Sebas3702

Decent cooler. you could get i5 9600kf and iverclock it to 4.5ghz+.
 
But a new gpu will be better for now.
 
Gigabyte has good 5600 XT's. Asus dual is also decent.
EVGA rtx 2060 KO is one of the best rtx 2060's. 

5600 XT or EVGA rtx 2060 KO will be good enough. Mayby even good model rx 5700 (non XT)
 
Now your cpu is still decent, yes it only has 6 threads, but new gpu will give you more performance than upgrading your cpu.
 
You have a decent motherboard so you can upgrade to 9 gen intel too, if you do the bios update. Something like i5 9400f, or i5 9600kf will be nice boost. What cpu cooler do you have?
 
gpu upgrade will fix your performance issues.