Full disclosure: mine isn&#x27;t especially successful, although it&#x27;s growing. That said, I subscribe to several <i>very</i> successful newsletters -- Stratechery Daily Update, Today in Tabs, for example -- and what I&#x27;ve observed is that 1) they&#x27;re consistent and 2) they have very particular personalities. Differentiation is an important part of deciding what content to include and how to present it. For what it&#x27;s worth ~