It's a small amount, so investing is not an option. I recommend to just create an encrypted paper wallet and forget about it.
Yes it is good idea that way invest our bitcoin and make it smart strategy because we are a type of cyrptocurrency that volatile movement.In terms of buying bitcoin make sure that the value was decreasing so that you have many ways to buy it.Then if time that the value of bitcoin will pump up this is a right time to sell it.A simple strategy but big income if you have an effort to so it.
I recommended you to buy more bitcoin while the prices goes down and hold your bitcoin and wait the right time to sell in order to gain huge profit. It is a way to maintain your money grow and continue engaging in bitcoin.