Board Thread:Questions and Answers/@comment-32002580-20180302023122/@comment-4199482-20180302025801

If it's like other mobile games, you can get root access for your phone and then find the file(s) that hold your account data. Deleting them ought to let you restart without having to redownload the whole thing again. I wouldn't know where those files are or what they're called so someone with more experience ought to chime in.

There's also automated rerollers but I don't know if the violate the ToS.