On the subject to minimize risks by spliting ones investment the best number is about 30.
That is saying that the risks are not correlated (have relation or connection). In general if you split it you will minimize the total risk.
With that said, I would invest in more cryptos BUT all investments need to be carefully studied and analyized otherwise you are blindly picking.
If you do blindly picking so if it is lost you dont know what the reason so you can not fix it.
Blindly picking of any coin is very high risk. To reduce the risk, we need to do carefully research.