Wordpress technical maintenance, speed optimisation, & SEO health audit

I'm looking for an experienced WordPress developer with technical SEO knowledge to carry out a comprehensive technical health check and maintenance of my existing website. My website recently experienced a fatal error following an update to the Modula gallery plugin. I've temporarily disabled the plugin through cPanel to restore access to WordPress. My hosting provider is Crazy Domains, and the website is currently running PHP 7.0.33. Newer PHP versions are available through my hosting account. I'm looking for someone to resolve the current issue and ensure the website is technically healthy, secure, up to date and performing well. 1. WordPress maintenance and plugin health *Review all currently installed WordPress plugins. *Update plugins to their latest stable versions where compatible. *Identify outdated, unsupported, redundant or conflicting plugins. *Check WordPress core and theme versions. *Diagnose and resolve the Modula gallery plugin error. *Restore Modula functionality while preserving existing galleries and settings. *Check compatibility between plugins, theme and PHP. *Identify any unnecessary plugins that could be affecting performance. 2. PHP and hosting environment *Review the current PHP 7.0.33 environment. *Recommend and implement a safe upgrade to a supported PHP version. *Check compatibility before upgrading. *Review hosting configuration and server performance. *Check database health and optimise where appropriate. 3. Website speed and performance *Conduct a full website speed assessment. *Test desktop and mobile performance. *Run Google PageSpeed Insights. *Assess Google Core Web Vitals. *Identify elements slowing down the website. *Optimise image delivery and image loading. *Review caching and compression. *Review database performance. *Recommend improvements to hosting configuration if necessary. 4. Technical SEO health I'm not looking for content writing, copywriting or a website redesign. My page titles, headings, meta descriptions and image alt tags have recently been reviewed. I would, however, like a technical SEO assessment covering: *Google indexing and crawlability. *Google Search Console errors and warnings. *XML sitemap functionality. *Robots.txt configuration. *Broken links and redirects. *Canonical URLs and duplicate URL issues. *Structured data/schema functionality. *Technical issues that could affect Google rankings. 5. Domain Authority, Domain Rating and Spam Score I've been advised that the website has low Domain Authority (DA), low Domain Rating (DR) and a high Spam Score. Please: *Identify the current Moz Spam Score and the factors contributing to it. *Conduct a comprehensive backlink audit. *Identify potentially harmful, suspicious or unnatural backlinks. *Investigate whether there are any genuine risks to my website's Google search visibility. *Recommend and implement appropriate corrective actions, with my approval. *Provide a report outlining what was found and what was done. I am looking for genuine improvements to my website's backlink profile and SEO health, not artificial methods to manipulate SEO scores. Please do not disavow backlinks or remove legitimate links without discussing this with me first. 6. Website security and backups *Take a complete website and database backup before making changes. *Check for malware and suspicious files. *Review WordPress security configuration. *Check administrator accounts and permissions. *Check SSL certificate and HTTPS configuration. *Ensure regular automated backups are in place. *Recommend any security improvements. Please do not redesign the website or change its appearance. Do not rewrite or alter existing website content. Do not purchase plugins, subscriptions or additional services without approval. Do not remove existing plugins or website functionality without discussing it first. Always take a backup before making changes. Please explain any recommended changes before implementing them. Please provide a fixed-price quote for the work and outline your experience with WordPress maintenance, PHP upgrades, website performance and technical SEO.