Tracking is extremely important. If you don’t track your rankings and traffic, you can’t spot the issues with your website.
What pages do the users leave quickly? You know you can improve those first, especially if the search volume for them is high!
Also, if you don’t monitor your organic search traffic you can’t know if you’re making any progress and, worse, you won’t know if the search engines penalized you or your rankings have dropped.
You can use Google Search Console and Google Analytics to monitor your organic search traffic and issues with your pages. They’re fairly easy to install as long as you have access to your server. You might even be able to install them via a plugin for your CMS. I recommend using Google Tag Manager to implement all tracking codes. They will be easier to manage afterwards.