How will you cross-check whether your SEO campaign is working or not?

By number of visitor, number of backlinks and average position at search engines

check google position and your keyword ranking

You can check whether your SEO campaigns is going in the right direction or not by analyzing traffic and conversion on your site from the keywords and pages you are ranking for.

If you are having high ranking for particular keyword on specific page and you are also generating nice traffic but there is no conversion than there might be an issue of keyword targeting.

If you are not reaching out to your target audience than there won't be conversions. So while analyzing any SEO campaign, check for this 2 things. Traffic and Conversion or CTR.