A few things, some of which are ConvertKit specific and some of which aren't:
- Never miss an opportunity to capture an email address from someone who might want to learn more from you.
- Using Link Triggers in Broadcasts and Sequences to allow folks to opt in (and out) of topics they want to see more or less of.
- Until it becomes untenable, respond to every person who replies to you.
- If you're going to sell, sell from the beginning. Folks who are going to be repulsed by you selling and unsubscribe early wouldn't have ended up buying anyway.