4. Filters
Do you need to set any other filter?
(why? to remove products which you know would be irrelevant) Filters are must-have Use Cases which all apply unless there are not enough results, then the bottom ones are removed first.
In general, it is not advised to use filters, but instead to use Rankers and Scorers unless you are 100% sure the filters should always apply.
Product Attribute Promoter : that's the standard case to create any filter based on your product attributes (new products, a specific brand of products, ...)
Article-Based Repeater : only for up-sell and cross-sell WPO: create a matching filter with the current PDP or current basket products (e.g.: same brand, same category, ...)
Product Attribute Value Retargeting : personalize on the prior product views of the visitor (most of the time should be a Scorer)
Promote purchased items & Attribute Values : personalize on the prior product purchases of the visitor (most of the time should be a Scorer)
When you are finished, click on Next