Yes your understanding is right. A profile cannot re-enter the journey until they exit it.  Adobe's note: https://experienceleague.adobe.com/docs/journey-optimizer/using/orchestrate-journeys/journey.html?lang=en Usually, a profile cannot be present multiple times in the same journey, at the same tim...

You can use inSegment function to exclude/include at journey level using expression editor for condition checks.

@ChetanyaJain But how can we build audiences using the lookup table and profile record?