I would probably play in the modern format instead of the Wild format. Modern takes 1/2 as much collection power to level up to the next level. It will take 500 collection power to reach Bronze 2.
Try not to let your ECR (Energy capture rate) fall below 50%. Check the informational circle next to RP earned to see if you are getting many negative bonuses from using the generic summoners and monsters.
Are you getting any SPS payouts from your wins?
If you are I would probably unstake them to use to rent cards if they are cheap enough. 1 SPS is worth .07 so could buy a couple of cards from CL each month.
!PIZZA