Why are you upgrading? You have two components which each might limit you, but in different ways. The CPU limits you when running something that demands more than 2 cores/2 threads. The 1030 limits you in games that demand something like a 1050 as a minimum in videocard power. There are also games, like PUBG, which will be limited by both.
Right now you have what I'd consider a budget esports gaming computer. As long as you stick to the games it can run you'll do alright. If you want to run more demanding games then you will need to change at least one of those components and possibly both.
For CPU upgrade only, I wouldn't move up to anything less than an i5 at this point in time.