i have a suggestion to draw arrow based on the trend direction of uni zigzag indicator next higher time frames on current chart.
example: M1 current chart and unizigzag channel indicator set for M5.
Trend direction - after confrimation of uni m5 dots (5nos)

DOWN ARROW
Ruel 1
If impluse bar (vertical line) is bullish (reversal) bar against trend direction, then its arrow down followed trend direciton dots
Rule 2
If impluse bar (vertical line) is bearish bar followed trend direciton dots , arrow down