How to get more energy for free?

So every day you click on the energy symbol and it’ll give you four or five videos that you can watch for free energy then after doing that you can use 10 gems to buy energy and then after the 10 gems you can use 20 I never buy more than that because it’s a bit of a waste of gems because it resets every day. If you go to their Facebook page they usually have a code active if they don’t when you check, they probably will the next day or the day after sometimes you can get free energy by Completing tasks if you get to the card reward also by joining a team