TBH i think You are fine with this CPU + graphics card for now.
It's not the end of the world, when some part bottlenecks. The question is, do You feel performance drops and does that bother You that much?
It will bottleneck sometimes, yes. 4 cores/threads is not enough in modern games? Perhaps yes, so? In one game You're gonna bottleneck CPU, in another title - GPU. So what?
You won't see much difference upgrading CPU, especially in 2K gaming.