Well there are a lot of Assets with great potential but pretty much everything has a high risk associated with the "potential" high reward.

If you want to take less risk there are the much more stable and reliable Bonds issued (i.e Ukyo.Loan, Graet.Loan, BTC-BOND, LTC-ATF.B2 or Coinlenders) with interest rates around 18% Per Annum. But you not gonna get rich over night with these and to be honest not sure the risk of investing in BTC/Stockexchanges is worth the relativly small reward or not.