Aside from writing to politicians, you could all fill in the public consultation right here (if you are an EU citizen):

https://edri.org/our-work/public-consultation-on-retention-of-data-by-service-providers-for-criminal-proceedings-answering-guide-for-civil-society-organisations-and-individuals/

There is an advice for filling it out in pdf form, making suggestions as how to answer, however answer how you feel about things foremost.

Thanks aforehand for doing your part!