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Please, add text content on the collection pages. Text content of listing category pages of any information website usually isn't useful for regular customers. That is why they can be closed for indexing by search engines. But text content of collection pages of any web store helps users: clients usually start their search from correspondent section.
Add for the each collection page unique description. For example, describe what goods may be finded in your store. Please, try to have description in the measures of 300 words. Pay attention that text content is necessary for people, but not only search engines.