SEO for an established business and website

Ours is the site of the World's top selling hot stone cooking products. A niche market, but with a growing number of poor quality copycat products hitting the market we need to make sure we stay steps ahead and own the different terms people could be searching with. Looking for someone to make a big impact over a coupe of days with a view to longer term role keeping things fresh and us ahead of the competition. Let us know what you can do and most convincing wins teh gig. Thanks