This is the easiest SEO possible. Go to Google Search Console, click performance, search results, toggle on average position, scroll down to queries, filter to position is less than 3. Filter again.
Impressions are greater than 80. Sort by impressions low to highest. Look for keywords where you're in position 2 to 3 which have less than 300 impressions.
These are keywords that you are already ranking for that likely have very low competition. All you need to do is create a short page for the specific keyword or even just include the keyword in your page. Then you can rank No.
1 for that keyword and save years learning how to do SEO that gets paying customers at compactkeywords com.