low value, meaning it is already listed on an exchange and has a very low price. I sell it more often because most of the altcoin prices obtained from bounties or airdrops will decrease over time. However if the altcoin obtained has not been registered on the exchange, there is no other choice but to hold.
well it could be also having low value due to being listed in dex in which most of the new altcoins are always getting listed there if they don't have partnership with the big exchange, usually onwards they would just lost the value overtime because the trading volume would also decrease, so if there's news that the altcoin gonna get listed in an exchange then it is a good news and definitely worthy of hold otherwise it will be wasting time.
usually i would just liquidate all and then convert it to bitcoin or ethereum, i just think that its better to hold these coin for long term because the prospect is almost obvious.
meanwhile i would rarely hold altcoin for too long other than the ones that are just fundamentally proven to be good and also have utility like being a smart contract that definitely would attract some demand, if its just some random altcoin without clear utility i think its not good to holds.