There are a few ways to tell if your website SEO is working. One way is to track your website traffic over time. If you see a steady increase in the amount of traffic coming to your site, that's a good sign that your SEO efforts are paying off. Another way to tell if your SEO is working is by looking at your website's search engine rankings. If you're consistently appearing in the top results for relevant keywords, that's also a good sign that your SEO is effective. Finally, you can track the number of leads and sales you're getting from your website. If you see an uptick in these numbers after making changes to your website or implementing new SEO strategies, that's a good indication that things are going well.