I will talk for fort battles.
1. Adventurer class needs rework. Maybe something like hiding and setting trap bonus similar to worker class. Maybe extra movement range(excluding walls,towers,buildings,gate etc.). Actually depending on hiding and setting trap skills they should be invisible to enemy team. Enemy team can see them depending on distance or skills.
2. New fort battle rank: Leader. We need people who can command fort battles. Leaders should get extra reward and maybe some sector bonus buff for team so we can move more organized.
3. Add abilities to fort battle. Similar to adventure abilities.
4. New resistance formula. Players with low hp should have much higher resistance. Rather than HP tank they can become resistance tank. Resistance tanks will invest in hiding and setting traps. So they will have better attack, dodge and damage stats than HP tanks so they should be more fragile.
5. Fort battle reward limit. Bond is actually fine but experience limit is too low.
6. Fog of war. All enemy within blindspots are invisible.