It has been a while. I have been very busy with school, but I've come with a new update which will satisfy a lot of hardcore players.
DynamicDifficulty was already 1.20 ready, but has now been updated with the spigot api too. In v1.7 you now have the ability to cancel death and change the health starvation and max health of players. You also have the ability to see the values of the difficulties in the inventories. Also a few more bugs have been fixed (like all updates). I've also worked on making DynamicDifficulty work with GeyserMC! I've also added some functionality to spawn MythicMob creatures for certain difficulties, so I hope people will have fun with that
Thanks for everyone who made suggestions and reported bugs and I hope you have a wonderful day!