General idea is like this:
go long when RULE 1 and RULE 2 are true:
RULE 1 - when USDT is in high demand (background is green)
RULE 2 - when Longs/Shorts is just recovered from Lower Bollinger Band
go short when the opposite is true.
This seems to work for the recent bear market while prices is driven largely by BTC margin or futures trading.
The rationale is that when a lot of people go short, the whales or the exchanges (who are of course unethical) will try to do the opposite to liquidate the accounts of retail traders.