Reeeelaaaaaxxx.
Tensing up in the wind makes your body act like a sail in relation to the bike and stiff arms will transmit steering inputs to the bike, magnifying the feeling of being pushed around.
Don't alter your normal body position as that just complicates things.
Try to understand how countersteering works (push on the left bar to turn left, vice versa for the right) in relation to your own bike so you can actively counter any inadvertent changes of direction.
Relax. Go with the flow, participate in the experience, don't fight it.
There are threads and threads of stuff on KB so use the search engine as well.
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