Poor Link building- too much emphasis on lots of poor quality links can get you in trouble with Google, particularly in light of their recent penguin and panda updates.
Duplicate content- some believe that having lots of pages which say pretty much the same thing but with a different title can spread the message further- this is not the case and the search engines will penalise you for it.
Fresh content- constantly changing things on a website to produce fresh content and for no other reason can confuse patients and jeopardise your brand identity.
Too much emphasis on Google- try and look at the wider picture, would your website survive without google? Tailor your seo to work with the likes of Bing and yahoo too.
Too much emphasis on seo- there are lots of digital channels with differing success rates- try out ppc and social media to complement your seo strategy and see if you can improve your ROI.
“If it aint broke don’t fix it”- just because you’re ranking well now doesn’t mean it will stay that way, Google are constantly changing the search engine results pages and it may not always be in your favour, so it isn’t wise to be complacent with your current traffic.
These tactics do indeed help with your websites search engine optimisation, however they need to be administered appropriately and in moderation so that they all work in harmony together to help influence the search engine results pages, rather than appearing as spam which results in your website not ranking at all.
For more information about diversifying your seo click here