Building a one-campaign ad account setup means creating a single advertising campaign with multiple ad sets and ads within it, all targeting Broad. Once you’ve created this setup, you can use Facebook’s AI optimizations to identify the best-performing ads and adjust targeting and ad spend per ad, per impression, accordingly.
To create a “winners” ad set, you would first need to identify your best-performing posts (i.e. those with the highest engagement or spend). You can then create a new ad set within your campaign and use these top-performing posts as the basis for your new ads.