Don't feed the monster - Much of US power comes from the vast revenues which are being fed by European countries.
Don't expose all of your transactions or secrets ( political or economic) to the monster by using their software.
Don't position yourselves where your critical data can be withheld at a whim.
Do invest in an EU/UK investment in local software /hardware- A few billion is peanuts compared to the revenue loss outside the bloc.
Don't allow politicians enslave the continent by listening to naysayers.
All of the above has been obvious for a couple of decades, the longer it's left, the harder it becomes - grow a pair!!