0.1 BTC is too little to even consider any kind of investment, what you should do is look for ways to earn more bitcoin, signature campaigns, offering your skills to the community for bitcoin or get a job, earn fiat and buy bitcoin with it.
you are right, in my opinion you cannot do anything too much with that money, i would just try to collect much more bitcoins to make money
I would say if I am going to be given with that amount I would just going to put it on trading and going to invest it with some possible alt coins that has the potential to pump at all. And I think I am going to be able to grow that amount because for me that it already a good capital. It is just going to
depend on the alt coins that I am going to buy.