you might start with keyword research, do an in-depth analysis, find the most specific keywords and begin with less competitive keywords for fast ranking.
After keyword research, develop the natural, keyword-optimized, and value-added content for your website pages. Also, establish a blog portion and publish detailed articles on relevant topics, mainly 2500 to 3000 words article.
Then do on page Seo, don't ignore the importance of meta title, meta description, heading tags, keywords optimization, and usage of synonyms within the content.
then Build backlinks, the simplest links are guest posting and forum backlinks. Continue this strategy for 3 months and you'll start seeing some results.