The main thing - do not use only bitcoin. There are a lot of alternative currencies, investing in which, you can get much more than bitcoin. Participate in the bounty, invest in prospective ICO, and then you can "make money."
And talking about investing in ICO, you can also participate in their bounty where there is an array of campaigns to choose from. All of those are free of registration and you only need your effort and time. At the end of the day, you can earn tokens from them that can be exchange to bitcoin. Thus, you are also making money.