End the success tax
Thomas, this is basically begging to be a Patreon package: a simple author newsletter workflow that keeps the success tax from mugging writers every time a subscriber list grows. New writers may not realize how fast subscriber growth turns into expensive “congrats on doing well” pricing. If it can talk to Excel sheets and a few core apps, that’s probably enough to make a lot of authors (me included) very happy and have them saying, “shut up and take my money.”