Look on semrush and similarweb for websites that are in your niche and look at what keywords they're using to drive traffic to their website.
To get more keywords from both those websites you need to get the pro versions but the pro versions are so worth the money if you're serious about boosting your website traffic through seo.
It lets you know what keywords are driving website traffic to those particular websites.
So you can use those keywords in your blog posts or other website articles to help drive natural seo traffic to your website from google and other search engines.