Jacko Dustloop — Focused Review & Actionable Guidance

• Jump j.D (Hit the opponent).
• Jump Cancel or Air Dash.
• j.D (Hit again).
• (Repeat as allowed by gravity/tech window).

Here is how the Dustloop wiki describes it:

In Guilty Gear Strive

The Art and Philosophy of Jacko Dustloop

: Jack-O's win condition is positioning a servant behind the opponent. This allows her to hit from both sides simultaneously, making her pressure nearly unreactable. Neutral Game