My gpu usage usually does not go above 40% while in games. This is causing frame drops and lag. My specs are rtx 2070, i9-990k, 16gb ram, using kde plasma. Any help is greatly appreciated.

Thanks for the help, but I found the solution: download and install gamemode for linux then download and install lutris. I dont know why, but game mode fixed all my performance issues. Using lutris is nice because it also enables gamemode automatically.