Here’s who to send them to:
If you want to do more, send a letter to all the Senators. They will all eventually vote on the bill. You can do it by simply addressing the letters to each Senator on the list found with this link. https://sencanada.ca/en/
Don’t burn yourself out. It’s better to send a few letters each week than to work yourself till you’re sick of it and then quit. This is a long game, so pace yourself.