OP congratz on able to clear BC that quick XD.

Anyways looking at the current progress of most players, turn 5 is not cleared yet by the majority of players. Basically turn 5 is created as a rather difficult challenge by SE to keep the majority players busy trying to conquer this finale so that they do not flood with complains of having lack of endgame.

It's good to try to be the first in everything, and then complete everything real quick to be a leader, but yes, you also need to expect a stagnant period coming after that as you wait for the new contents to release. Every games are the same, new contents are not gonna release every day, it takes time.

Only way is just set another goal like maybe becoming the richest player in the game

Edit: Imagine if there have been no video guides or whatsoever guides on the dungeons/raids, you will definitely consume way more time trying to conquer the endgame. It is just thanks to those guides, things were made so much easier.