The APU is a CPU + GPU.
The CPU portion sits below an FX-4300, and the GPU portion is very poor for gaming (probably below an R7-250).
The best value would likely be to buy a dedicated graphics card like a GTX1050Ti.
Upgrading the CPU would help too but I'm not sure how much money I'd spend before it would be better to build a new computer.
(you'd plug the monitor into the new addon graphics card BTW, so you'd not be using the GPU portion of the APU anymore).
For example:
1. run DDU to remove drivers
http://www.guru3d.com/files-details/display-driver-uninstaller-download.html
- use recommended option for SAFE MODE removal
2. finish DDU then shut down
3. add video card
4. Plug monitor into video card, then start Windows
5. install...