-The first cheat or exploit is to not skip the tutorial, even if you're an advanced player and this is your second, third or fourth alt account. The beginner's tutorial gives you lots of free stuff and rewards, which are some of the most valuable items in the game.
-Keep watching ads and collect more and more daily currency rewards.
-Play daily events for more chance to get better currency.
-Practising to get better time in PVE or offline mode. Don't skip any unleashed events.
-Use ad packs from the store to get currency . And free packs can be obtained every certain hours.
-Watch Youtube or Twitch videos: gamer's gameplay style and tutorials.
-Play against many different opponents with many different gameplay style.