There are signs that the market value and exchange rate of altcoins have bottomed out, providing opportunities to go long on altcoin exchange rates, but going long on altcoin denominated in USDT depends on the trend of Bitcoin.
For example, using 20,000 USDT to go long on ETH/BTC, while simultaneously opening a 10,000 USDT short position on BTC and a 10,000 USDT long position on ETH for cross-currency hedging.
When the exchange rate strengthens, if BTC rises and ETH rises more, or if BTC falls and ETH falls less, it can be profitable.
However, the altcoin (ALTs)/BTC exchange rate has been weak for many years, making it difficult to determine whether this time is a rebound or a bottom reversal, so operations should be cautious and set stop-losses.
In theory, any altcoin related to BTC can be operated this way, the stronger the exchange rate, the better.
Not directly going long on USDT is because it is uncertain whether the strengthening of the exchange rate is due to BTC rising or falling; directly going long on altcoin denominated in USDT will face the risk of BTC correction.