holding alts are not dangerous if you will study every altcoins that has a posibility to go to the moon,  and what alt coin you will hold, just like what happened on CARDANO, its just like a wild card that goes to 6 (now) on coinmarketcap. when it  was on its peak its on top 2. always remember to read and study. those altcoins will be our backup if bitcoin will drop again just always be careful on what altcoins you will invest.