> When's the last time you saw someone pepper a House district with self-made signs?

Never, because it would be totally ineffective. Incumbents in Congress have about a 95% win rate[1]. For almost everywhere in the country, districts are what they are and no amount of hand drawn signs are going to change it.

1: https://ballotpedia.org/Election_results,_2024:_Incumbent_wi...

I'm not necessarily disagreeing, but I think it's worth pointing out that you don't have to win in order to have an impact. It could well be that the incumbent retains his position because he made moves to address your concerns.