If your utilization is at 80%, that means you have 20ish% still left on the table. It shows that your 1660 has more to give but something is holding it back.
I see why you are having trouble hitting 240 FPS; your system RAM is way, way too slow for a Ryzen CPU. Ryzen CPUs need fast system RAM to work properly. Your CPU is bottlenecking your GPU because your CPU has been bottlenecked by your system RAM. 3200 MHz RAM is considered decent for Ryzen builds, 3600 MHz is better.
FYI, people who play 240 fps at 1080p almost always roll with Intel processors. Intel processors don't provide the same value as Ryzen, but they do boost to much higher clock speeds on all cores which is what you need for high FPS gaming.
Another thing, are you running with V-sync on or off? Go to the Nvidia Control Panel, click on "manage 3D settings," and for the V-Sync setting, switch it to "fast." This will cause your 1660 to send as many frames as it can to the monitor similar to V-Sync off, but without any tearing.
So i need to upgrade to at least 3200mhz but 3600 is better. V sync was off i just set it to fast.