Yeah, Mastodon's unwillingness to allow max post length to be easily configured is a huge issue (dating back to 2017!). So frustrating.It's worth checking out GoToSocial --it meets your requirements of > 500 characters (and includes Markdown formatting) and more than 4 images. It's still beta but very solid, I've been using it for @jdp23 for a while (with phanpy as the web interface) and love it. K&T hosting has plans starting at $3.75/month - https://www.knthost.com/gotosocial @AnthonyJK @paule