Well first we need to start off if you have a Google play/ Android account if you don't have one be sure to MAKE one! If in this instance a password is or may be lost it would be easier to make another account to an email. When you've completed this, make sure you have all your account info written down and REMEMBERED this is one of if not the most important part! After the is completed try to locate your progress by either restarting or uninstalling and reinstalling the app. If you've located your progress in this instance or grinded back to the point, than be sure that whenever your are in the main menu be sure to hit that cloud save button MANY people pass this off so be sure to press it! If your progress is still not located then please reply and message back and I will try my best to find a solution like I always do.