Which type of audiences should you use to help drive purchase goals?

Past product viewers are a highly relevant audience for driving purchase goals because they have already shown interest in specific products by viewing them. Retargeting these individuals with relevant ads can re-engage them and nudge them towards completing a purchase. Lifestyle audiences are too broad and may not have immediate purchase intent for specific products. Past purchasers who are not subscribe and save holders are valuable for repeat purchases, but "past product viewers" directly targets those who have demonstrated recent interest but haven't yet converted, making them ideal for immediate purchase goals.