Definitely liking how ActivityPub works with my two blogs. However, there are a few limitations.
http://elizabethtai.com/2023/10/15/some-flaws-with-activitypub-and-wordpress-com-integration/
Hey, an awful lot of Mastodon instances have tweaked the character limit to remove the low bar.
This one, qoto, is effectively unlimited in my experience.
You might want to consider joining one of those instances. After all, that helps signal to Mastodon devs that users want longer form capabilities.