What you can do: https://www.patrick-breyer.de/en/posts/messaging-and-chat-control/#WhatYouCanDo
Contact your MEP: https://www.europarl.europa.eu/meps/en/home
Edit: Article linked is from 2002 (overview of why this legislation is bad), but it is coming up for a vote on the 19th see https://www.patrick-breyer.de/en/council-to-greenlight-chat-control-take-action-now/
My point being, what are they going to achieve with this? Ask WhatsApp to pass over their encryption keys?
It should be pretty obvious that you shouldn’t be sharing sensitive stuff on chat apps controlled by the NSA. Use element with encryption or something, maybe Briar etc. What are they going to do if you insist on using apps which use asymmetric client-side encryption, break TOR? Force you to use symmetric encryption and give the government your decryption keys?
I don’t see how they are going to spy on sensitive details of Europeans with this. They might as well ban phones completely if they want to limit communication.
These laws are being passed by politicians who generally don’t understand technology. What they will achieve is a reduction in privacy and liberty for every citizen in the EU and easier methods to clamp down on dissent. Just because it’s not technically perfect or difficult to implement fully doesn’t mean it’s not a threat. It’s one step closer totalitarianism, and what’s stopping totalitarianism is everyday people, one step at a time, battling it back.