Are you just starting Season 2 yourself and think it takes too long to get through the seasonal questline? Here is how you can skip the «Complete Chapter X of the Season Journey» requirements of the seasonal questline!
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The only requirement is having someone who has already completed the needed Season Journey chapter. Simply group up and make sure that the person with the progressed Season Journey is the party leader so that the game is using the party leader's state of the world.
The quest will automatically progress to the next step given that the party leader has completed the required chapter of the Season Journey.