The market is falling sharply, I see signs of not healing, capitalization is withdrawn, should I continue to buy in the top 10 coin or should I pin down USDT and wait for new move? 
Yes, there have been a lot of things that have had a big impact on this market recently.
China has banned the use of cryptocurrency, South Korea has imposed controls, hackers have attacked the currency exchange, and Google has banned the encryption of money advertisements, which have had a bad effect on the market. At present, the market is in a bear market, I suggest that it is best to wait and see for some time.