I do not hold bitcoin as of now but I must had put my Bitcoins into trading if I was holding any. You can trade with many brokers currently with BTC as base currency, its benefit is you can make profit slowly and if value of Bitcoin rises, it is like ice on the cake. Inexperienced traders can opt other things like lending their BTC on interest. Other traditional ways are to invest your Bitcoin into real estates to earn rental income or in any other traditional business.