Individual action will never do anything on this. It has to come from privacy laws, the GDPR was a good step, but we need to go further.
Make storing personal data like storing hazardous material. Something you absolutely avoid if possible, and treat with extreme care when you absolutely must store it.
Unfortunately the users of this site would rather tell you to move to the woods, go off grid, and paint dazzle camouflage on your face before admitting that a solution has to come from society rather than the individual.