Please consider before you make a decision.
I only suggest investing these two coins long term. 1. Bitcoin 2. Ethereum. 3 years is long enough for the project to withstand extreme market conditions. Of the many coins I have seen, only two of them I believe can last much longer and they have also proven that in previous years. If you have already made up your mind, don't ever hesitate with the price going down sharply because cryptocurrencies will continue to rise and fall sharply, there is no need to panic, that is the key to success.