Please help me how to change account because I want to login in my older account and I have to clear data to login my older account.Is there any option that I can change DQ account without clearing data please help me 
I already talked to them about this. Basically, this game isn’t compatible for multiple accounts / people. You have to have one account, erasing the old one, un-install, and re-install the game, then log into the other account.