Everything and all at once
My newsletter is called Everything And All At Once (a blatant rip-off from the title of a very good movie), and is highly unpredictable.
I don’t know when I’ll publish and I don’t know what will be in it. That’s the opposite of a good newsletter. As every build-a-brand-marketeer knows, I should “find a niche”, “be consistent”, and “publish at regular intervals”.
Signing up is probably a mistake.