You can invest your money an altcoin with low prizes, after it grow you can buy ethereum with your earning. But i prefer to keep ethereum in my wallet. It is very promising and strong coin. It will be earn to you soon, for sure.
Out of 1, half should be hold in ETH and rest could be invested in other coins as market starts to rise all coins mostly will rise and few will provide some exceptional multi fold returns. SO if you hold that you can double your money quickly in coming time. So spread your portfolio.