How to cross-check if the SEO campaign is working or not?

Check your organic traffic and SEO tab in Google Analytics to keep track. then You may monitor the effectiveness of SERP and links to your website using webmaster tools.

The first step in determining whether or not your SEO effort is effective is to look at your website's statistics, which reveal the source of visitors. The other method of verification is to conduct a search using pertinent keywords and keyphrases and then review the search results. The quantity of search results will indicate the effectiveness of your SEO approach.