There might be other opportunities. I’ve never donated to a Congressional campaign, but I’ve run into my representative twice in the last month without even trying-- once at an environmental group’s holiday party and once at the local university’s MLK commemoration. I have also met with the staff of more than one federal senator and representative to talk about specific bills and strategies, just by organizing a group of friends to work on the issue and asking for an appointment. No campaign contributions needed or expected. Staff are very influential in shaping legislators’ opinions and actions.
I guarantee your congresscritter has an in-district office, so you wouldn’t have to go to DC.If you’re really frustrated and unable to get on the schedule, you can always show up in a big group, refuse to leave, and livestream the whole thing.