I played democracy 2 and 3, and am excited to play 4 as well.
Here are my suggestions:
Play as an opposition party, and interaction with politicians and media
It would be good if there is a way to play as the opposition party leader if the election is lost.
You can criticize the current leader, and interact with politicians and activists.
Even when you’re the president (or other type of leader), the interaction with other parties will be an interesting element as well.
It would be good if there are ways to interact with other countries or governments.
If your country is governed well or if you have stronger army, you will have more international power to influence other countries.