Start to sell something? How could you if the market is down, you should do the opposite, buy more in the dip. Don't base your selling point on gas fees, instead sell base on big profits. Unless you would go quitting and never come back, that is why selling on low market. You are giving ideas to people to sell their assets, it is called panic selling in short, or maybe should I say FUD.
Well, he means that we should sell something to increase our capital and buy more the dip because the gas fees right now are pretty low compared to when the price is high. Many people are lazy to do transactions because the gas fees are high but because it's pretty low we should take this momentum and do what we can't do previously. Selling something doesn't mean we should sell our assets but we can sell our creativity, our skills, etc.