FPS consistently decreases across every game.
Sure, I'm ready to give it a shot. What would you like to try?
Reset your system if necessary, and consider restarting it as well.
Execute DDU to eliminate the Nvidia drivers, then reinstall the newest versions afterward.
Consider moving from Asus GPU tool to MSI Afterburner. This update nearly fully resolved the issue with my RX 480 G1 gaming.