Quality Contextual Links on niche relevant sites can does the Trick!
Make sure with the article quality : Needs to be Unique article & moreover the contents should Attracts visitors to come back.
Also, Make sure with the Keywords! because they help search engines understand the context and purpose of your website's content. This improves your site's visibility, attracts targeted traffic, and increases conversions and revenue
Think about what keywords people enter into Google to find your product. For example, they might search for something like “blood test service ”
See, you can't expect overnight results or quick results! As long as you keep building quality Links, You will get to see your keyword rankings.