Now that paper is stable, we've gone ahead and released v4.14.0 for free! This includes 1.18.1 support along with some new features. This does not include any of the 5.0 API changes.
I have gone ahead and released MythicMobs v4.11.0 free version. This contains a ton of bug fixes since the beta release, and some new compatibilities required for the latest Crucible builds, so go and grab that! And if you enjoy it, please leave us a nice review.