Once your first hero hits level 70, there’s still plenty to do, such as earn all the story mode stars. If it’s your first max-level hero, level the other two hero types. If you want to focus on your level 70 hero, get that hero’s set gear and legendary jewelry.
Reforge your gear and try out different gemstones to see which stats help maximize damage. Use the training grounds on Elderath to measure the damage output of your hero and companions.
Run trials of valor, then compare your progress against the best players on the leaderboard and participate in special and seasonal events.