I do agree to some of the comments and posts on this thread, the best way to invest your 0.1BTC is either through trading altcoins but it does take some time so you really need to have lots of patience for you to earn a certain amount. Then the other way to invest is through gambling; though it is the easiest way to increase your profit, it is also the riskiest way and so it might be the easiest way to lose your money too.