It’s impossible to answer without knowing what your financial situation is and what your investment objectives are. I can only give you some general guidelines.

You should invest in Ethereum if the following apply to you:

Risk tolerant
Patient and level-headed
Do not need the money for at least 2–3 years
Looking for high upside
Only invest money you can afford to lose
If you are unable to handle the emotional swings from such large price movements then investing in Ethereum is probably not for you. If you are the type to panic sell when a drop like that happens then it is definitely not for you