You will need to pay attention to your on-page SEO regularly and be patient in order for it to be successful. The size of your website and how often you publish new pages will affect how often you need to check your site for SEO issues. Do on-page checks and updates at regular intervals, and you will be successful in managing your website. For example, a blog post about a current event may not need to be analyzed and updated as often as a popular product page, because they have different purposes. You can use the Site Audit and On-Page SEO Checker to help you keep track of your site without having to moniter it constantly.Planning regular audits for on-page issues is a good way to stay on top of things. If your audits keep returning no issues, then you can reduce the frequency of them. However, if you find that you're constantly missing important competitor updates or issues on your own site, you may want to increase the frequency. You can set regular audits to run automatically for as many pages as you want, and you'll get an email summary every time an audit is completed. The greater the size of the website and the number of people who can make changes to it, the more likely it is that those changes will unintentionally cause other problems. If you regularly check the website using Site Audit, you can be alerted to any new issues that arise due to activity within the company or from external sources like changes in search engine behavior. If you have complete control over the website's content management system, you should be able to fix most problems yourself, but if you aren't able to do that or are uncertain how to use the CMS, you might need to get your developers to help you.
(source: https://www.semrush.com/blog/update-on-page-seo)