if we distribute bitcoin to another altcoin is good at top 20 rank in coinmarket for sure we are less risk. Especially the newbie what they are buying does not know the value of the coin they just make them hyper groups. So Controversial Remember that your bitcoin is very dangerous if you invest in a different coin. Investigate before invest.
Diversification is good, but buying other alts is not diversification!
A diversified portfolio is one that doesn't move in syncronisation (the idea is that you don't lose everything because everything moved down at the same time). Alts tend to move with bitcoin, so they arn't ideal for diversification.
If you want to diversify, sell some coins and put money in land, or gold or bonds.
Well, I can't say that I completely disagree to what you said. The trend shows that altcoins are also following the same trend as bitcoin. When bitcoin goes down, majority of the alts go down as well. But only the majority of alts, not all. In real investment world, we have concept of "contra fund" which literally means "Contradictory fund". This particular fund is created to make profit in the falling market by buying those stocks/assets who usually goes up when the market is red. If you have tracked the stock market closely, you will see that when a stock market enters red zone, Gold and Silver prices goes up because investors then try to hedge their position by buying these precious metals. This is the same technique used by the contra funds.
I have been tracking the crypto market since a long time now and I have seen few such coins do exist in the market. When the crypto market enters red zone, these coins goes up. However, I am not getting a very clear picture because of the number of altcoins we have but I am trying to get to a definite point.
I encourage the OP and you to track for the same and probably we will be able to point out some definite alts which is showing such kind of behavior. I am not able to devote much time to these because of my jobs and other commitments, but if we can find these, it can be proved as a very nice hedging for us.
But whatever you said about diversification, I too agree that one should not invest in coins only to safeguard their positions. Real world investment like Gold, Bonds, bank deposits are good tools to have as an investor which can support us in difficult times.