Ethereum is one of the best investment on cryptocurrency after bitcoin, even sometime it's better to gain profit from ethereum than bitcoin. But you need to analyze the market before you do investment, you should invest on cheaper price, and now is the right time for you to invest on ethereum.
Etherium is like a blue chip in the regular stock market. You usually don't find big profit in a short period of time and it must be treated as a long-term investment. If you want a big profit is a short time, you are better to invest in other small altcoins - same is true to the stock market.