Contact your Senator
https://www.senate.gov/general/contact_information/senators_cfm.cfm
Though they are even harder to get a hold of than House Reps, you can still try and at least they can’t say you didn’t. Kinda, takes away their excuses.
Also know the Senate Committees https://www.senate.gov/committees/index.htm
See their scheduled meetings https://www.senate.gov/committees/hearings_meetings.htm