pixel_player899218 I assume you are talking about challenges, which are completely optional, they are mainly for those who have lots of energy and food, feel free to skip them if you feel they cost too much, or maybe do just 1 for achievement if there are not enough event materials in the main story, which is not the case with 8th birthday.
Yes we've asked for energy rebalancing (or rather equipment rebalancing to give more energy) for a while now, you can also put in your thoughts about it using a support ticket if you wish.