I don’t think they read these.
I remember years ago sending a letter to John McCain and the response was about another issue that I did not write to him about.
The ONLY was to get a response from a senator is to find out who their “people” are. Then write a letter to the Senator and copy the specific person with a cover letter.
If you send a form letter or “rant” you will get a form letter back. They cannot read all the emails.
It is important to know that if you are trying to get something specific done, rather than just voice an opinion.