The market is falling sharply, I see signs of not healing, capitalization is withdrawn, should I continue to buy in the top 10 coin or should I pin down USDT and wait for new move? 
It is better to be out of the market. To be in USDT or USD and observe. This will prevent unnecessary losses. You will have time to buy coins again. It is important not only to get income, but also not to receive losses.Thats completely wrong step. What if you are in the USDT and then the prices for the coins start rising again? When you will buy then? After getting the prices spiked and then again people will start crying about the losses they got because of USDT holdings. I know the prices for USDT is set to $1 buck but thats like making you funds restricted to one stop and no spiking effect for the same. The prices are moving up and down with sharpness and yo util have no time to re-buy what you have sold. I know opposite effect can also happen but we know very well one day everything will be back to normal. So why complicate the situation.
How many times have I said to myself: do not rush, there will still be time for the price of a coin to go down, and many times I've been wrong. When you are in the USD, you need to keep a very close watch so that you "have time to jump on a rocket".