Instead of investing in bitcoins the better option would be to invest in altcoins that is having cheap price and in that case he can accumulate high volume of coins and if price pumps then then sky would be limit of his profits depending on how high that altcoin goes.
Indeed, the best thing to do with that amount is to put it not some altcoins, because some ones have a pretty big potential to rise in the next few months, and if you look for the best ones there are ones that costs less than $50 like etherium or monero coin.
I usually do not suggest into altcoins but seeing the relatively small amount and to gain back in shorter period of time then I also believe investing into altcoins would be the right option rather than gambling or active trading options too.