BB Pullback Strategy - Persistent Fractal Trend

In Uptrend, when price pullback and reach the lower band, expect it to bounce, thus enter buy at lower band.
In Downtrend, when price pullback and reach the upper band, expect it to bounce, thus enter sell at upper band.

Uptrend and Downtrend is decided by using William Fractal (3 bars) HH, HL, LH, LL