Add a new feature that gives players rewards for reaching power milestones, similar to the city breakthrough event but focused on power not city hall level. For example, milestones like 1M, 5M, 10M, 20M.. power grant players rewards. This system would give players goals to aim for, make progression feel more rewarding, encourage and motivate players to be more active especially low spenders and F2P players by showing that their efforts are being rewarded, making them confident of themselves and less likely to give up and quit.
Also the rewards will get better for each milestone you reach. For example:
- 1M: 15h of speedups, and some resources.
- 5M: Epic commander sculptures, 24h of speedups.
- 10M: better rewards, and so on..
Lastly, The rewards shouldn't be overpowered but also not too weak or disappointing just enough to keep motivation high.