If you look carefully, youi will see that the graphics are all the same, so it makes no sense to diversify here.
And if you look again, you will see that while everything is in the red, bitcoin remains the least negative out of them all. When bitcoin goes down, all the alts go down harder. If bitcoin goes to zero, all the altcoins will go to zero too, so you aren't reducing your risk at all. Also, when bitcoin goes up, sometimes the alts go up with it, bust just as often they go down even further.
There is zero point in "diversifying" in to alts, as has been mentioned. If you want to diversify your holdings, then look at more traditional investment vehicles - anything from gold to shares to bonds to property. There are a very small number of altcoins (probably less than 5) which have some new useful technology or feature which bitcoin does not, which might be worth looking in to or purchasing from a technical point of view, but there is no point purchasing them from a "reducing your risk" point of view.
Go to the altcoin boards or /r/cryptocurrency and ask all the people there who "diversified" in to a bunch of altcoins back in 2017 how that's working out for them. Bitcoin has recovered from its dip down to $3k, whilst most of the altcoins have only sunk lower.