Move around your map to find different areas to unlock. Check the three possibilities

described below: 

1) You can unlock new blocks (squares) in the district where you are working with your in-game money. That will mean more work… But more money!

 

 

2) If you tap on the blue arrow that appears in your unlocked blocks, you can upgrade them and build new buildings, as well as get some extra money thanks to new multipliers:

 

3) You could also unlock new districts with your in-game money. Once you could pay it, you will be able to manage another fire station simultaneously! The previous progress in the other districts won’t be affected, but your new fire station will start from scratch. Do you accept the challenge?