Contents of letter, timing, how written, & to whom makes a tremendous difference.
Remember one letter to a Senator about our re-wharehousing 55 gallon drums of Agent Orange at the Naval Base in Gulfport, MS, after Hurricane Camille, whereby I received a personal call from the Commanding General of 5th Army, (then in Texas), & a few days later received a personal letter from the Senator & President Nixon -- the mission was immediately halted!
Have witnessed quite a few other favorable "earth shaking" results with letters to Senators & Congressmen, in the past, so I continue to write.
Behind the scenes, most are aware of the record division occuring "today" that never was witnessed before in our history -- some of our particular statesmen, with narrow margins, are literally walking on pins & needles.
Just my opinion, very good time to write, but cc letters to as many "concerned" citizens as possible & spread the word -- King George did not read his letters either, but George later told King George where to go.