I always thought it silly to invest all my savings in one thing. Best of all, choose several promising and interesting projects and coins, and distribute your investments between them.
Yes, diversification of investments is a very good thing, it helps to reduce the probability of failure. In addition, I would recommend not investing all available money, better invest half of the funds, and leave the second half for unforeseen expenses. Perhaps the price of the coin will fall even more and you can buy some coins at a lower price. 