Just wanted to share how I prepare or save energies for Ladder or for Sunday. XD
1. Save all energy rewards from Wishing Well 2 days before Ladder/Sunday
2. Save all guild chests 2 days before (Chance to get energy)
3. Save all energy from event or daily login rewards that can be claimed thru mail
4. If you have a Water Mill, do the ene expedition (day before Ladder/event) and try your best not to press garrison until the ladder or the bonus/es is/are active
5. Try to do a proper timing and save the energy from Water Mill and click it on time
6. Claim the event rewards/achievement chests during Sunday or when the Ladder is active
7. Claim all energy rewards from daily quests and guild quests when ladder starts or when the bonus/es is/are active.
*You can maximize these techniques (Like saving energy rewards or guild chests for 3 days) if you can do them in proper timing but I suggest the 2 days because it is safer and rewards from mail expires in 3 days (I think?).
If you guys have more techniques, feel free to share them.