我是否应该将我的网站升级到PHP MySQLi或PDO？

I have designed a website before 5 years using PHP MySQL and still works fine without any issues. I heard MySQL is officially deprecated as of PHP 5.5 and has been removed as of PHP 7. Also, PHP offers three different APIs to connect to MySQL (like MySQL, MySQLi, and PDO). My web server is updated frequently.I have designed a website before 5 years using