Trying my best bro. I'm able to consistently get from Bronze to high Diamond with rentals now. Not much of a profit in terms of DEC itself, but I never lose DEC in the process. So pretty much I take the chests from quests as my main profit and always get a little bit extra DEC.
Next step is finding a way to keep my power to start a season already on the high ranks and try the Champ League once again. Haven't found the path to that one yet.
!LOL