Canada

My two cents: Imagine you're writing a polite (or not) note to your neighbour about something they or one of their family members is doing that is causing harm to your neighbourhood.

State what you don't like, why you don't like it and implications, preferred paths forward, and outcome you'd like to see. If you know what your 'neighbour' campaigned on/the rhetoric they used, particularly if you voted for them, you can reference that (for example, "The Elbows Up movement united Canadians at a time of great uncertainty. It is incredibly discouraging to watch our representatives drop their guard against US interests with no regard for, and active hostility to, the interests of Canadians." or whatever).

If you want, you can close with the suggestion that should you feel they are not adequately advancing your interests as a constituent, they will not have your support in the next election. Taking from the neighbour analogy, think "If you don't shape up, we'll take this to the HOA (your fellow constituents) and kick your ass out."

How much good does this all ultimately do? Depends on who you ask, really. But as a Canadian you have the right to express your opinions and concerns to those who represent you in government - so say what you want heard. No matter the impact, it's better than silence.