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.