Many many folks swear by the old tactic of duplicating ad sets.

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This is often done to “reach new pockets of the audience” or to “scale the account rapidly”. While this is technically true, these efforts are being accomplished, the net impact on your ad account is rarely positive.  What often is exciting, and very lucrative short term, tends to also be exhausting, and very limited in its return, while also creating more damage to future growth. These efforts of duplicating to get greater access to spend and audience, also exacerbate the downside of our accounts. This will magnify negative feedback, increase CPMs, decrease Estimated action rates, and ultimately will limit the potential upside of an account.  This strategy does work, especially in the short term, because Facebook will try to incentivize the early impressions of any effort. However when you start to chase a flywheel like this, but you end up doing is delivering more and more impressions to lower and lower quality individuals. This in turn hurts the likelihood of your content being seen by users who want to see it. This ultimately will hurt your estimated action rate and your feedback/advertiser score.  Because Facebook's primary objective is to keep people on the platform as long as possible, and let them have engaging in positive experience, while also delivering consistent results advertisers… The effort of trying to exploit an audience, and forth spend and impressions where they might not be best for Facebook business objectives, ultimately create a liability for your business objectives.  A much more effective way of accomplishing these goals is to build Evergreen, Control Campaigns. Understand what your business objectives are at a very high-level, and focus on directional growth to achieve them.  The long-term directional growth is infinitely more powerful than short term highly volatile actions that create long-term liabilities to the advertiser.