A question so general that it cannot be answered. SEO activities are a long-term process that should be planned and, above all, diverse. From updating the website by publishing a blog, for example, to acquiring both dofollow and nofollow links, and above all creating a natural link profile, which is not easy.

Hi, the category page must have its title, description and headings properly set. Additionally, it would be nice to have some content describing a given category. Then you can send category subpages to GSC and wait for the results.