The pve leveling is good, you are motivated. The economy is developing (new buildings become available). Level up rewards are gold and gems.
PVP less motivated, level up rewards are mostly not much, players are not motivated to level up. PVP expeditions without blocking are not worth the resources going into doing them, they are only worth it if the rewards are granite or titanium, but those are taken away after 1-2 days. If you are lucky, you gain a little profit. And the population is a problem because pve and pvp use the same limit.
Here is a simple solution to be motivated.
- Every pvp lvl up should give a few gems.
- Expedition Water Castle should give extra storage capacity and population
lvl1: + 1000 storage capacity, + 20 population
lvl2: + 2000 storage capacity, + 40 population
lvl3: + 3000 storage capacity, + 60 population
...
lvl15: + 15000 storage capacity, + 300 population
Sum at lvl15 (pvp lvl30): 120k storage capacity, 2400 population.