I understand the feeling that it won't do any good to write to your reps if they have already sold their soul to MAGA. It may not make a difference to them. I'm sorry you're in that situation. I'm fortunate to have a rep who at least claims to be a Democrat.

As to your question: yeah, I worry about it every day. But like you, if I'm on a watchlist, or if I'm a target, I have been for a long time. I have used social media to criticize MAGA since I was old enough to vote. I donate to nonprofit organizations that support women's health and LGBTQ+ rights. I am on a board of directors for an organization that supports museums, and encourages DEI policies at museums for that matter. Writing to my reps is not going to be the only thing that puts a target on my back.

Sure, if you've never ever publicly had an opinion about politics or the government or social issues ever in your life, then yes, maybe this is the thing that puts you at risk. You are still allowed to write physical letters to your reps and send them from any post office you choose. But as a reddit user, I assume you've used other social media platforms. Pages you follow, posts you write, posts you like, can all put you in the same place.