When contacting your U.S. government representatives, it's better to call than it is to send an email (though email is better than nothing!). You can call after hours to leave a voicemail.

i like to have a little script beforehand. Here's a good model:

https://autisticadvocacy.org/wp-content/uploads/2017/02/fact-sheet-how-to-call-your-elected-officials.pdf