To optimize your XML sitemap for SEO, you can use multiple XML sitemaps for different types of content, such as posts, pages, products, images, videos, etc. This can help you organize your website better and provide more specific information to search engines. Additionally, the <changefreq> and <priority> tags can be used to indicate how often and how important each URL is. This can help search engines prioritize their crawling and indexing resources and improve your ranking potential. Furthermore, the <lastmod> tag can be used to indicate when each URL was last modified. This can help search engines detect any changes and update their index faster. Finally, the <xhtml:link> tag should be used to indicate any alternate versions of your URLs, such as different languages or devices. This can help search engines understand your website's internationalization and responsiveness.