Magento Admin Login Fix

My Magento admin panel stopped working today. The storefront is up, but the backend login page never appears—no error message or redirect, it simply hangs. I haven’t touched any site settings or server configurations recently, so whatever broke did so without an obvious trigger... (Budget: $10 - $30 USD, Jobs: cPanel, Database Management, Linux, Magento, Magento 2, MySQL, PHP, Web Development)