Below are some tips to Optimise and Speed Up a WordPress Website

Use a caching plugin:  A caching plugin can help your website load faster by saving static versions of your pages and posts in the browser’s cache. As a result, users won’t have to download the same files each time they visit your website.

Optimize your images: Large images can make your website load slowly. Reduce the file size of your images without compromising the quality, compress and optimise them.

Delete any plugins that are not being used:  Unused plugins can make your website load slowly. Disable or remove any plugins you are not using by going through your plugins.

Keep the latest WordPress installation:  Regularly, new versions of WordPress are released. Performance enhancements and security fixes are frequently included in these updates. To make sure that your website is as quick and secure as possible, keep your WordPress installation updated.

Enhance your database: Your WordPress database may clog up and become slow over time. To optimise the performance of your database and clean it up, you can use a plugin like WP-Optimize.