"Upgrading" any of that is probably going to be like putting a band-aid over a gushing wound, but a 980X is going to be the best CPU you can put into that motherboard, along with 24GB of triple channel RAM. However, I would double check that your motherboard's BIOS supports both of those.

https://www.ebay.com/sch/i.html?_nkw=Intel+980X

https://www.ebay.com/sch/i.html?_nkw...e+channel+24GB

I don't know how much that will all cost you, but it looks like a few hundred dollars, at minimum. After that, buy a new GPU and see how it all works out, but if you want to go this route, I would expect that you may not be able to re-sell any of this hardware because it's so old. So, you might be throwing money at it for no reason since it may continue to perform below the level that you desire.