Now the township leader who is not playing the game for too long, can lose the leader's position which will be transferred to the most active player in the township. The details can be found in this article.
If you used to be a township leader and now your position is transferred to another player, you have several options:
1) You can talk to the current leader and ask whether the leader agrees to transfer leadership back to you. If the leader agrees, the leader can contact the support team and ask to make you the leader again.
2) You can create a new township.
3) You can continue playing in the current township but on a different position, or join another township.
To avoid losing the leader's role, please play the game at least from time to time, and your position in the township will be saved.