Honestly the best to do is to buy $100 of 10-20 currencies under $1 in the top 200 in Coinmarketcap. I saw a picture of a index that invested $100 in each top 10 crypto currency on Coinmarketcap on the 1st of January 2017 and to this date that $1000 is currently worth $25000. Which represents a 2500% gain although unlikely to happen next year investing a small amount in a range of different currencies as if one or two or even a few go down the others will likely have gone up to make a good profit.