Leveling and Stable Question
I'm relatively new to the game, have 72 heroes in my stable, 3 are 4* unawakened, and I have a butt load of 3* and 2* awakened. I've been using my 3* awakened to do event and storyline quests. I also understand that Arena's are the way to get shards. My question is, where do I focus? Should I try to level everything, or is there a strategy to leveling as well?
Thanks!