Maximizing the Results of SEO service

[Maddy]

In order to boost the performance of my website, I got the services of a very good and recommended SEO expert. While we were talking about the strategies to be employed, they openly suggested the usage of specific keywords that will make me spend more but generally put my site on top of any search engine results page. I did prefer it and my site really got boosted up on the top of the lists. What worries me now is that it comes with a downside and this is all about slow traffic to my site. What should I do?