Congratulations. You have taken into account the points I told you to change, except for the Instance in the main class which is still superfluous and replaceable for my taste, that's perfect! :) Good continuation in the development of your plugins :)

Plugin rather heavy for its functions, you could already remove your statics, a call of the class main in a constructor to avoid it would be more intelligent, I advise you to put your plugin and presentation in English to reach more people, concerning your configuration, you call it each time someone makes a command or that it needs an interaction, sometimes 2x for only one execution, try to save your configuration in the ram of your server to avoid having to call it on the disk each time. Regarding your messages, you could create a method to enable/disable Vanish and at the same time send your messages, it would increase the visibility of your code. Don't hesitate to use the Lambda to avoid for() loops. I didn't have a good look, but what about the reload function in your configuration? Good luck, I guess you are a beginner! You'll get there!