Let me teach you a little trick, observe the Binance gain leaderboard every day, research and then short. For example, if something suddenly surges on Coinbase or Upbit, wait for a while after the trend emerges before going short.

Uptrends are always unsustainable, they often drop more than they rise, so occasionally going short is fine. There is a lot of knowledge here, requiring extensive research, practice, and observation. For example, even though something is rising, the uptrend of $BANANA will not be as sustainable as ACUTION (hitting a new high in 9 months often indicates very strong capital.)

For example, the sustainability of something like $ID is also weak.

This doesn't mean you should open a 75x large position recklessly; it's fine to play around with small funds.