I'm kind of over the game so i'll drop some tips because they are really trying to push you to spend money in this game (and its not worth it).

With the gacha chests count the cards you open till you've received 10 and refresh your game on the 10th card, you'll get the rewards and when the game loads again you can open the cacha chest again straight away, no 6 hour wait.

Closing your browser and messing with the computer date ( Changing date 1-2 days forward) can reset your energy and faction war tickets (had 1 day left when I unlocked faction wars and managed to do 10 games by messing with my computers clock to reset tickets).

Enjoy