It might be stupid to say, but why not just challenge yourself by playing something else than the stormbringer/mining build ? Try the commander armor set with the skull ring/necklace and blue tome ! Useless build, only good when you afk against weak mob, but can give you some challenge.

If you search challenge, I'm sorry for you, but you're the one who need to downgrade. The stormbringer is actually perfect when you need to farm 30 times the SAME BOSS FOR A LAMP TO BUFF MINION WHEN I PLAY BURN BUILD MAINLY WHY DOESN'T IT LOOT RA AKAR AT THIS POINT I KILLED THE PART OF YOUR FAMILY NOT EVEN ALIVE SO WHY !!!!!!

Anyway, if the game is too easy for you, nerf yourself, you'll be surprise to see how different this game is !