FFXIV automatically kicked me from Novice Network

[Vaer]

But why do i have to do all that in the first place, this system is very depressing making all those good friends and then kicking you out of nowhere without having done anything wrong.

Did you lose the mandragora bud? That would kick you out of it. It gets removed automatically after a certain amount of hours or you finish some part of the story.

After SB came out it is :
Have played less than 168 hours
Have not completed the main scenario quest "The Far Edge of Fate"

If you meet any of those the other ways of getting back in is to become a mentor or unsub so you can get returner status some way.