A few emails from very few people achieved:
Suppressors for varmint hunting in Texas back when it was taboo.
A reversal on destruction of milsurp brass from government auctions.
A reversal on the SS109 bullet “ban” executive order.
I was involved in all 3 of those and in the first it was reaching out to congress critters in Texas when I lived there (and a big hell yeah to Linda Tripp who also reached out then). The other two were reaching out to those outside my state. Sometimes it does not a damn thing sometimes it accomplishes a whole lot. Try and you might be pleasantly surprised. What do you have to loose other than some time.