If you truly want to optimize your site for the web, be aware that continuous maintenance will be required. Any website requires some maintenance to maintain it fully optimized at all times.
An SEO site audit doesn't have to be a huge, intimidating task that you keep putting off. In fact, the more you do it, the easier it will be to keep track of your health. Your site will do relatively well for any low-competition keywords you're going to target if you simply remember the most fundamental components of SEO: establishing a keyword, including relevant information, and ensuring your site doesn't have any broken links.
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