Website Technical SEO Cleanup

My site needs a thorough technical once-over so it can climb higher on Google. I’ve handled the content and basic on-page tweaks, but deeper issues—speed bottlenecks, crawl errors, schema, indexing quirks—are holding the pages back... (Budget: $30 - $250 USD, Jobs: Content Management System (CMS), GTmetrix, MySQL, PHP, SEO, Website Audit, Website Optimization, WordPress)