Internal SEO cleanup for small website

Need internal SEO optimization for a small website (about 10-15 pages). Please review the site structure and fix common on-page issues so pages are easier to index and rank. Tasks: check titles and meta descriptions for duplicates and missing ones, improve H1-H2 usage, add basic internal links between related pages, clean up broken links and redirects, make sure canonical tags are correct, generate/update XML sitemap and robots.txt if needed, and provide a short report with what was changed and what still needs content work. I will share access to CMS and Google Search Console. Prefer changes done directly on the site, not only recommendations.