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Actually your SEO is probably already suffering with an out of the box install of WordPress (your self hosted version) but what usually happens is a user installs an SEO plugin and either they simply do not use it (thinking it will somehow magically do all the work for them) or/and they fail to go back and use the plugin on existing posts.
If you do not use one of these plugins you should. Otherwise how are you controlling your SEO? Do this experiment. Go to your WordPress site and find any single post then view the source. Then search for “<meta name=”description” and see if you find one. Chances are you will not. So how are search engines supposed to call your site “search engine friendly”? Search engine friendly, by the way, means human reader friendly.