What can I do if the alliance leader is inactive?

There is nothing you need to do :)

If your alliance leader has been inactive for over 15 days, the leadership rank will be automatically moved to the player with the officer rank, who has been a member of the alliance for longest, and has been active in the last 7 days.
If there are no such players, the rank will be moved to the longest serving member who has been active in the last 7 days .

Keep in mind that the support team won't be able to accelerate this process nor change the leadership rank back after it has been re-assigned.

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