For me, investing all your savings to 3 cryptocurrencies you have mentioned is not really good idea. Why? because you cannot say what will happen the following days or months if the prices will either go up or down. It is very risky and the rates are flactuating. Also, what if something emergency that might happen in few days or months with your own personal life. Be proactive about uncertainties.
You're right investing all your savings in cryptocurrency is too risky. Don't ever do that because there are more possibly will happen to the next 5-10 years either bad or good news. I know being negative thinker is not good for the business but sometimes it could help us to make a better decision in life.