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All i can suggest is, reset any oc/fan settings to stock in 3rd party app(delete profiles also) and Wattman.
Uninstall 3rd party app, then disable wattman(Preferences > Restore Factory Defaults).
Then try a Clean Install AMD Graphics Drivers , Do not enable Wattman in fresh install or reinstall other oc app yet.
See if game starts/runs.
You should not use wattman with other oc apps for the 390, they will conflict (i have a 390G1).
The above is for win OS, i don't what changes are needed in fedora OS.