Sometimes over time, you need to clear the cache of each web page so that the site loads quickly to visitors and Google puts the site in a better position in search. It’s a great SEO practice that is used by millions of sites to improve the performance of the site itself. The plugin significantly reduces the loading time and you only need to install it.
How to install and apply a plugin to WordPress
All you need to do to use this plugin for free is to search for a plugin under the name W3 Total Cache which you can find after logging into the WordPress site administration in the category »Plugins« and »Plugin Installation«. All you have to do is install the plugin, apply it and everything will be automatically improved.
Other practices that can increase traffic for free just by following certain policies can be read in the article What are the basic rules of seo optimization. I also recommend the All in One SEO plugin (What is the most used SEO plugin for WordPress) created for every WordPress site.