To try and rank your collections pages higher in search engines, you'll want to set the SEO settings manually. You can control the SEO settings for your collections pages by editing the Title, Description, URL Handles, and Tags on your collections. Your collections titles and SEO titles can be different to improve your search engine results. SEO titles might be more aligned with what people are searching for and give search engines a better understanding of what the collection is about.
To add or change SEO on your collections:
Navigate to Content, go to Collections, select the collection where you want to add SEO, then click Edit. Under the SEO tab, set the SEO Title, URL Handle, and SEO Description.
NOTE: As with all SEO changes, it may take a few days for changes to appear in search engines and when the link is shared.
As of now, tags are used to Search Content on the Catalog, but they do not impact SEO. If you would like to have this functionality, please Submit a Feature Request.