There are several ways to improve your search in the online store, but it all depends on what search criteria you or your customers choose. For example, this extension https://www.mageworx.com/shop-by-brand-magento-2.html
will help you make search by brand convenient. This is important for online stores that sell branded clothing and accessories. I believe that you need to analyze the behavior of your average customer in order to understand which filters are best added.