It seems like the best time to sell altcoins is over, as we know that the best history of altcoins is 2017 until March 2018, almost all altcoins prices go up because they follow the trend of bitcoin prices, now we can only survive and wait for a miracle.
Agree with your words, still, there are chances to increase the altcoin prices, most of the people failed to sell there altcoins in the year 2017, now most of the people who are holding altcoin are kept waiting for an altcoin to recover the prices, but nobody doesn't know how long it is going to take for the altcoins to recover their prices.