if you invest i would warmly advice you to invest in one of the weaker currencies.
Tron for example is more likely to go from 7 cents to 10$ than bitcoin from 10.000 to 150.000.
the percentage gain is the same in both scenarios (its all about percentage).
If you can lose 400 then just buy something which is cheap and might become expensive in a year. buy it and forget that you have it, and every 6 months or so take a look how its going.
ether was around $7 last year, now its at 1200 or so. which is a 18000% increase, while bitcoin did in the same time 1000% (1000 to now around 10.000)