What's a promising way to increase your remarketing list's potential impressions?

Including similar audiences is the most promising way to increase remarketing list potential impressions because it expands your reach to new users who share characteristics with your existing remarketing audience, thereby increasing the pool of eligible impressions. Grouping multiple audiences with AND logic would narrow your audience, decreasing potential impressions. Decreasing the frequency setting would allow more impressions per user but doesn't inherently increase the potential pool of users. Including the audience that has been to the "Thank you" page is a good remarketing strategy but doesn't expand the audience size beyond those who have already converted.