To try and rank your collections pages higher in search engines, you'll want to manually set the SEO settings. 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 you want to add SEO to, then click Edit. Under the SEO tab, set the SEO Title, URL Handle, SEO Description, and any Tags you want.
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.