A world with no accountability is a world without individual safety.
One’s individual right to remain anonymous does not necessarily take precedence over the societal right to hold one accountable. The pendulum of that tension swung all the way to fully anonymous over the past decades, and we now have the most unsafe Internet that has ever existed.
It will, guaranteed, swing back from full anonymity, as already began with many things one could previously access anonymously (such as email verification only) online or in person: Cellular service (ID required), FedEx shipping (ID required), many Discord chats (verified phone number required to defend against sock puppet attacks), and LinkedIn name changes (birth certificate and photo ID required). Whether it swings back to “no right to pseudonyms” or instead cones to rest on lesser outcomes such as “identity protected by law” and “a warrant is required” is up to politicians to decide.
Politicians do not accept and consider anonymous letters, so adhering to the outgoing belief in perfect anonymity may severely construct your ability to influence the outcome of the pendulum’s backswing away from it. I hope that when you write your politicians about this issue, you are doing so in handwriting from your registered voter name and address, so that they are considering your input at all.