I'm at the game about a month, now I'm facing a problem that really keeps me from playing further. Coins. I dont know what hapoened, one week im short on all resources, then the next i have more skill points and keys then I can earn coin. I have almost all silver fighters in duplicates(except Eliza) and three gold ones. (No complain there, super lucky) but I'm just sitting in this "gold mine" unable to unlock skill trees. I could maybe at most unlock 1-2 silver fighter's skill a day, and don't dream about unlock a gold fighters skill tree. Is this a normal phase? Is there something I missed? Because I saw posts about grinding skill points but not on coins. Thanks in advance.