Don't buy backlinks. Even if you manage to buy "good" backlinks:
- Last two updates made it clear those sites will be penalized.
- Most of those backlinks are from spammy sites with good DR but it won't help a lot.
Build content.
Write or have someone to write.
Cover topics so that you have additional content around the main article to answer all the questions people ask.
Check Core Web Vitals.
Internal Linking. Stay away from clickbait and be more beneficial towards users and the search intent.
Use tools for content optimization (Robinize, SurferSEO, Frase..) and keyword tracking tools to understand what you need to do to outrank the competitors.
Learn. Measure. Learn some more.