I would agree with some of the other comments here suggesting ICO's or undervalued crypto's (typically cryptos in their early days) but with a huge amount of potential. Check their roadmap, or follow telegram group and see if they have any big announcements coming up or release of new versions, etc., this is when there is likely an increase in the community interest and you can profit while others jump in a little late.  There are definitely some good ones out there now too. Personally I feel these options offer some of the biggest opportunity for significant returns, but also take a lot of research. Always a risk though, of course.