I don't know if it's still true, but pre-pandemic I used to have occasional contact with legislative types, and they regularly told me that physical letters carry more weight than phone calls, and email was a distant third.

Pretty much, the amount of effort you put into your communication is a reflection of how important the issue is, and how important it is to you.

Which kind of goes hand-in-hand with lobbyists. Companies don't pay them millions of dollars to send emails or rant on web forums.