One other thing I'll say is having the newsletter has been really helpful. I imagine most of the traffic that came from the initial launch wouldn't have thought

One other thing I'll say is having the newsletter has been really helpful. I imagine most of the traffic that came from the initial launch wouldn't have thought to ever return to the site if it wasn't for the newsletter & RSS feed. If your product isn't content related (a SAAS for example), a curated newsletter targeted towards your niche could be easy to maintain using a tool like https://www.getrevue.co/ https://www.getrevue.co/ and is a way to keep potential customers in the loop until they're ready.