1. Trade only 1 pair of currency: usdt and altcoin
2. Invest in good altcoins only (1-5 crypto), focus will bring about higher chance of winning. Treat btc as an altcoin and make a speculation with it. Learn how to identify a good crypto in order to hold the coin whenever the storms come.
I also agree with your opinion. always we need to focus on usdt. means how much usdt you invested and how much usdt you earn from it. And obviously we need more knowledge about crypto trend.
"when btc will down and alt also down.' "when btc down but altcoin up?" "when btc up also alt up" "when btc up but altcoin down" we need to generate this time correctly then you would not be loss your money by trading.