I generally have 2 methods for shorting:
One is to open a large position with low volatility b, then set a small stop-loss. Either chase a breakout or open when there is resistance on the trend line.
The other is with high volatility 'copycat' b, usually waiting to do a secondary high after a peak, not shorting if there’s no upper shadow, and not shorting if the negative fee rate is too high, then starting with a small position. Once there’s a price advantage, begin rolling over, betting on a spiral decline.
Shorting is difficult; to make significant profits, you can only roll over. I don’t really recommend playing with contract months. You might roll all the way to the end, and then a big rebound could wipe everything out.
Also, some people can get addicted to shorting, and when a bull market comes later, they habitually short.
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