Help!

I've been playing HMW for about three years now. I've noticed that I'm always losing Energon after every mission or arena battle. It always costs me more Energon to repair my 'bots than I'm earning in either Arena battles or missions. I've tried the Battle Beasts Gambling, and I've lost all of my Energon twice trying to use it to bring in more Energon. I won't do that again. Can anyone out there give me some tips or advice? Thanks.