Site audit is a very important tool for the owners of any site, because it will help to identify site errors and indicate exactly where errors were made on the site. It happens, and not even rarely, that after the launch of the site, a month, three months or even more pass, but some pages of the site do not go through indexing in search engines.
The reason that the pages of the site are not indexed can be one problem, or even a number of problems. A technical site audit is just the tool that will accurately indicate problems that interfere with the normal operation of the site and its indexing. After correcting all the errors and imperfections of the site, it is likely that your pages will be indexed normally.
Page analysis tools
There are many tools in the Internet that will perform a site audit for free, but with limited capabilities, and only the main page of the resource, but still helps in some cases.
More professional services have a paid subscription, but they do a more detailed and in-depth check of all pages on the site, indicating exactly where the problem lies, and moreover, they can give instructions on how to fix these errors. Most people limit themselves to only free services for technical audit of pages, and in some cases it helps, especially if this is a landing page with only one main page. If the site is large, corporate or even an online store, then there is no way to do with an audit of only the main page of the resource.
For a thorough analysis of the site, you need to use paid services that will really point out the problems of the sites and suggest ways to solve them, and you can solve these problems yourself if you understand the page code, otherwise, you need to contact the specialists.
It is best to immediately contact the specialists who are engaged in SEO optimization of sites, because most of them do a site audit for free, and will point out the problems that are on the site pages, and immediately put up a price tag for solving all problems.
Raising page rank in search engines
Even if you make a complete analysis of all pages of the site and solve all the identified problems, this does not guarantee that the site will start gaining momentum at the same hour and will rise to the first pages of popular search engines, this is by no means the case. Of course, it will help to improve the position, but raising the page in the TOP-10 is unlikely.
Site analysis - will help to identify errors that need to be corrected, and after correcting all errors, the pages need to be optimized, promoted in order to get into the TOPs of Google and Yandex, and this is a set of measures and this requires months of painstaking work on SEO promotion, and injecting money funds, but after the pages are in the TOPs, then all the work and investments will pay off with interest.