I recently started playing again after three years of inactivity. My guild seems to have fallen off completely during these past years. Is there any way for me to take over the guild and begin building that up again? Or is my only option to leave the guild and find/start another?
Welcome back.
Unfortunately, unless you were already an Officer or Guild Master, there is no way to seize control no matter how long the staff has been inactive. Your options are either to stay where you are, or abandon ship.