In my opinion:

-They need to add more Ninjas that we can buy for Ninja Points/Moon/Sun points in the Exchange shop.

-They need to bring back MGM (Mission General Mobilisation).

-Add a Night Mode *on for the players in Konoha. Night Konoha should already be in the game.

-Add an x10 -x50 x100 baits *on for the Fishing Mania event.

-New F2P events and more BTs for F2P ninjas.

-Slightly lower the coupon/ingot price per fragment for all events. Who in the right mind would pay 1250 coupons for 1 fragment of something?

-Cut the requirement for Ino Flower from 300 back to 250 flowers. Like it was in the past. Or even lower (200).

-Add a loyalty-based system handing out freebies for veteran and spender players.