SEO advice

my website www.theradiatorshop.ie has been in existence since 2011. We are about the only dedicated online seller of radiators in the Rep of Ireland. For this reason we rank high for most key organic search terms. However, things are changing and other companies are starting to improve their websites and new players are arriving on the market. I want to consolidate our position on google searches and improve it where needed. I have key words which I believe are used to find us, but I want someone to analyse my google analytics and my competitors websites (i will list 5) and advise on keywords to use. I also want you to please analyse my site and provide a set of easy to understand recommendations for changes to the website to improve ranking on google- I need a strategy! to start immediately and deliver in 5 working days. Thanks!