Want to get more replies to your emails?
Keep them shorter. A paragraph max.
A lot of times I get really interesting emails that contain 3 or 4 different themes and are many paragraphs long.
I usually don't say, "Oh, this is too long, I'll never reply to it." Instead, I say "I'll get to this later."
But then I don't get to it later.
Write shorter emails if you want more replies.