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1. Create links only on high-quality sites
2. Avoid sites with high spam score
   3.work on guest posting

The answer to your question is - to find low-hanging fruit keywords.
Low-hanging fruit keywords typically show up on Google's second, third, or even bottom page. Despite the low search traffic, they are still able to draw in the right audience because of the lower competition.
To find and use such keywords to generate more traffic for your site, you ca n follow this guide - SEO Low Hanging Fruit Keywords

@viveklazy It takes time for the backlinks to be crawled and reflected. But if it's been a long time, you can perform few activities that will help you index your backlinks. You can follow this for more help - 11 Tips to Index Backlinks Faster On Google