just pop in a SSD, and get a 1050Ti at most if you planning to keep this system for next 3-4 years
1070 is a big NO for any i3 old or new
if not and u plan on a new rig in next 2 years
get GPU when you find a good deal, then get better CPU, when ever you find a good deal.. GPU first as they just came out, in about year we will have 7nm and 10nm CPUs so wait for them, CPU is not worth upgrading at least not in 2019, wait for 3rd gen ryzen and 10nm Intel chips