The RTX 2070 or RTX 2060 Super have roughly a 15% performance increase over the VEGA56.
Unless you finding your performance sub-par or you want RTX, I see no reason to spend a lot of money for a small performance uplift.
For some free performance, you can always overclock your CPU and GPU as long as you have decent cooling and case airflow. I could see a CPU bump to 4.6 or 4.8ghz would really bump performance in demanding AAA titles.