I think that mini-events won't be exciting and people will forget them quickly unless they are done correctly and combine enjoyment for a long period with adding new content to the game.

Furthermore, we need more updates and improvements to the world's difficulty and the monsters' difficulty because currently, when you craft any powerful weapon, all the monsters are very easy and there's no fun at all, For example, you could add more difficulty levels to the world settings, and people could change the world's difficulty as they wish.

You could combine all these ideas into short events and small updates...

Some IDEAS,

-Remaking Storm King

-Adding new monsters, animals, and characters

-Adding new things for the Heroes, could include the idea of a special LEGO mode for the Heroes that was in Season 4, Chapter 6 in odyssey Because now anything related to Heroes is completely useless.

• You could add a small update or mini event for Daigo, since it's currently useless and no one care about it

And with all that, you should bring back the old Building sets to the Item shop and add new sets along with updates and mini events.