I think any of these suggestions if they are needed:
-Allow the transfer of progress between regions, obviously from regions on the way to disappear or die, low number of people etc
-add more information in the war register for example who takes the building, who attack the building, etc.
-release the continuation of the story
-add more characters and 4 * weapons that are obtained on the map
add more weapons in all pools.
You are welcome to add more suggestions and your feedback