Keyword research will show you what searchers are looking for. It will give you a better idea of the content you should create and the keywords to use in your main website pages to attract the searchers. With good research you’ll find the big search terms but also the long-tail keywords and specific searches that are easier to rank for. These will give you some great traffic sources to improve your SEO. Without research, you’re guessing, and you’ll likely miss some simple and quick wins.