Having nudged over the 600 blueprint line submitting my next design, I can see level 4 is 1000 blueprints. The end is mathematically Impossible now. Four rounds, 200 to submit, say 4 stars per round target, end should be at 2400 blueprints..
and here’s a couple of ways to make it fairer:
1) split the competition into 10 groups. In CoM you compete against cities of similar level. In DCs you need to do the same as a level 30 city will not have access to the same materials as a level 99 so it isn’t fair. Say 1 to 19 (as so few under 20), 20 to 29, ..., 90 to 98 and the 99s on their own? Or 90 to 99.
2) when the votes are all in, again split into groups of 10. The lowest 10% get 0 stars, the next 10% get half a star and the top 10% get 4.5 stars. The winner is boosted to 5 stars. On that basis, to reach the end you would need to be in the top 20% each week (if 4 star average to get to the end) and that seems a fair ask to me. 3.5 star average (top 30%) would be better but might be seen as too generous; top 10% (4.5 star average) too tough an ask, especially given the randomness of the voting, and will put people off.
i do like the idea of rolling over DC coins posted below. How’s this for an incentive? Coins roll over and you can buy stuff (to keep, not just for the DCs) using them, e.g. Eiffel Tower 5000 DC coins, a lake 500 DC coins, ... say 1 DC coin = 1 sim coin: 50 DC coins = 1 sim cash and 500 DC coins = 1 golden key and 1000 DC coins is a platinum key as a conversion rate? Something like that ...