Urgent WordPress Backend Fix Needed

Urgent WordPress Backend Fix Needed I need an experienced WordPress developer to help fix a backend issue on my live business website. The website is currently running live, but the backend/wp-admin is very slow and showing critical errors. I need to be able to log into the backend normally without causing any issues to the live customer-facing website. Site details: Hosting is DreamHost Theme is Jevelin PHP is 8.3.30 Cache plugin is WP Rocket Performance plugin is Perfmatters MalCare WAF is also installed The live site must stay up and working during the repair. Please do not make changes that could break the public website. I need someone who can: Access the site through DreamHost/File Manager/FTP if needed Review WordPress debug logs and PHP error logs Identify plugin conflicts or corrupted plugin files Stabilize wp-admin/backend access Safely disable or repair problem plugins Check WP Rocket, Perfmatters, cache settings, optimization settings, delayed scripts, database cleanup settings, and cache drop-in files Check whether the PHP OPcache or server cache needs to be cleared Check for slow backend causes, including cron jobs, plugin update issues, memory limits, or server resource problems Avoid restoring the database unless absolutely necessary Make sure the live site remains functional throughout the process Current issue: The front end of the website is live, but the backend is slow and showing errors. I need the admin area fixed so I can access WordPress normally and manage the website without errors. Please apply only if you are comfortable troubleshooting WordPress via the file manager/FTP, PHP error logs, wp-config.php, plugin folders, caching issues, performance plugins, and hosting-level issues. I am not looking for a designer. I need a technical WordPress troubleshooting expert. Please briefly explain how you would approach this without taking the live site down.