Any good SEO will tell you that you need to have good content. One way to add more content to your site is to make use of RSS feeds. RSS feeds are plentiful these days, and they are a good way to add relevant content to your site. However, the actual process of parsing an RSS feed for display on your site can be a daunting task if you have never done it before. It involves installing scripts on your server as well, and that may not be an option your hosting company allows. However, there is a much simpler way to add a feed to your site, that is even customizable using CSS stylesheets. Several sites will convert a feed of your choice into a simple javascript code that you place anywhere you want the feed to appear on your site. My favorite is https://www.amerivault.com/news/syndication/amvrss.php but another good choice is https://jade.mcli.dist.maricopa.edu/feed/.
So, for example, if you wanted to add SEO Scoop's feed to your site, you would click on the little orange XML button at the bottom of the home page. (Other sites may show different graphics, often it will be an orange RSS button). This will take you to the raw feed code. You can ignore the code itself. Instead, copy the URL of the feed that appears in your address bar (in this case, https://www.seo-scoop.com/rss/seo-scoop-rssfeed.xml). Now go to the AmeriVault RSS parser page at https://www.amerivault.com/news/syndication/amvrss.php and paste the SEO Scoop RSS URL into the form. Configure your colors and options, and you can see the output of what your feed would look like when you hit the Go! button.
A simple search in Google for "your subject matter" + "RSS" will probably result in quite a few options for content you can add to your site.