Web admin to help wordpress and other website duties

We’re experiencing significant performance issues with our WordPress website, particularly with the speed of the server and the admin dashboard. Additionally, when updating product pricing, the assigned product categories frequently become unchecked or fail to save. We often have to repeat the process two or three times before the changes are successfully saved. We’re looking for an experienced WordPress developer or administrator who can diagnose and resolve these issues, optimize our website’s performance, and ensure the backend functions reliably. We need someone who can identify the root causes and provide a long-term solution rather than temporary fixes.