Kosmos is a plugin I think could be really useful for projects such as minigames with some of its features. I'm not entirely sure what versions it supports (I think it is 1.14+). It is a skript addon that allows you to manage worlds in a server, including unloading and duplicating worlds and that can be great for having minigame worlds that are used once, and then are deleted and reset.
The plugin link is here: https://github.com/TlatoaniHJ/Kosmos