This is an absolute yes. Internet and its rankings and parameters are constantly changing. Let’s imagine that you have paid for San Francisco SEO, and your webpage is now ranking high. So, you think that is ok for SEO, and you quit any kind of strategy that was being implemented. This can be a mistake. Some things can work one week, and the next week can be completely different. The search engines’ algorithms fluctuate and change from one day to the next. And if you are looking to stay on the top positions, you need to be constantly researching, updating and testing through a good SEO campaign.