Here are some alt coins you can buy currently :

1) ETH: You can  buy this any time irrespective of market situation. However, if the price is decreasing over last few days, buy at dips and be prepared to wait for few months for good profit.


2) Ripple: It is available for a little more than half of a dollar. If crypto sees boom like last year, you can make about 10 x with this coin in next 6 months. No other coin will give you this much returns.

3) Finally, invest 10% of your money on risky projects for higher returns.