The "priority" field in a sitemap.xml file is intended to provide a hint to search engines about the relative importance of the URLs listed in the sitemap. The value of the priority field is a number between 0.0 and 1.0, where 0.0 represents the lowest priority and 1.0 represents the highest priority.
It's important to note that the "priority" field is a hint and not a directive. Search engines use a variety of factors to determine the importance and relevance of a page, and the priority field is just one of many signals that they consider. Therefore, it's not possible to provide a precise or guaranteed level of influence that the priority field will have on a page's ranking or visibility in search results.
In general, it's a good idea to use the priority field to indicate the relative importance of URLs within your sitemap, but it's also important to ensure that the actual content of the page aligns with its perceived importance. Providing high-quality content that is relevant to the user's search query is the most effective way to improve a page's visibility in search results.