The bitcoin will rise also so I think you need to be fast to gain more bitcoins and than stay holding it.
But really 100$ is bit big enough capital to invest in tradings, i suggest to invest your money in tradings because in that program you can make big money their if you learn and practice the right strategy, and also if you have lot oF time well thats very nice because by that you can. Monitor the movements of different coins so it was portfolio for you to earn again in another coins, i will also suggest if you really a risk taker come and invest in new hyips just make sure that hyip is new so you can do earn and run tactics there.