The market is falling sharply, I see signs of not healing, capitalization is withdrawn, should I continue to buy in the top 10 coin or should I pin down USDT and wait for new move? 
When in doubt zoom out. A perfect crypto portfolio must have enough exposure. Its not about top 10 or any number, but 'the reason' why you are putting your money somewhere. Have a reason to buy or sell anything and reverse think your moves. HODL will be easy.