It's still worthwhile for a few weeks, I am getting a hashrate of about 22mh/s at the moment but that will drop to 16mh/s from the 21st Jan.
As other have said probably worth trying to sell any 4gb cards to buy 8gb cards.
Now it makes no sense to sell 4GB video cards, because new video cards are very expensive, like used 8GB video cards.
It should be borne in mind that used video cards could have been in mining for 3 years or more.
It is better to continue mining Ethereum Classic and other coins in Q1 2021 until new video cards appear on the market at a good price