I wonder if we can still optimized our articles on related keywords after we have put up the content for a couple of months. Note that changes will be done on existing content pages rather than new contents. Hope i can find my answers here.
Yes you can. Google crawler always search for updated content.Also it crawl entire website again & again & find update.
You can optimize your content by spreading the keywords evenly throughout your article/post. Try using on the point expressing of your ideas instead of using long and difficult phrases. Stay focused on topic of your page and your content will improve.