with the crypto market conditions like this I think holding is the best solution. because if you choose to sell, you will suffer losses. and if buying is also risky because the market can fall deeper. you should start buying when prices start to rise. in investing in the crypto market we must be good at reading market conditions.
That would be the good decisions of the coin holders, if he see that selling coin even if the price is in falldown and he will gain even little then go , but for those holders that invested a high price coins then you must sacrifice to hodl your coins so that to avoid much capital loses and better to invest more low price altcoins as of the moment.