I have a simple three page website that ranks #3 in organic Google rank. The current site is looking outdated and in early stages of a redesign project. Is there any way to change the markup of the entire site and keep the rank or make it better?
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Markup
Don’t use table-based layouts. Use appropriate markup such as headings, microtags, images (with alt text!), and so on. You’re missing meta description tags. You don’t have a doctype, and the cut doesn’t validate.
Lots of improvement here alone.
Content
You have no content to speak of. If you want to become an authoritative resource, you need to be pushing community content hard. Videos, tutorials, case studies, contests, and so forth. SEOmoz has many great guides for thinking up content for tough niches. Trust me it’s possible: I’ve seen a radiology company in particular produce killer content, that in turn produced a massive community. Yes, for radiology, a contender for the most difficult niche to write for long-term.
Don’t be discouraged by not having a ‘fun’ niche. Although, yours certainly isn’t bad.
Link Building
You have no links to speak of. If you really want to rank in Google (and please, shoot higher than #3) you need backlinks. Again, looks like the SEOmoz beginner guide would help you out here.
Most white-hat methods these days include asking politely for links or guest blogging. You can go a little further than that and participate in grey-hat methods without any harm, but do be careful. And be sure to start multiple sites to test methods on before trying them on your flagship domain.
Best of luck.