What content should I send out to the Formspree Newsletter?

The @formspree newsletter has nearly 1k subscribers but I have no idea what to send them. I've just been sending product updates. I'm struggling to decide what else to post.

Here are some ideas:

• Static site tool comparisons (CMSs, hosting, ...)
• How to build a static site theme on various platforms (hugo / gatsby etc)
• Upcoming features