SEO for website for which On-page is completed

I am looking for an experienced SEO specialist to improve the search engine rankings of my website. The on-page optimization has already been completed. Yet the ranking is not improving.

So, the focus will be on people who can provide advanced help in improving SEO. They should analyse the present ranking and find out the reason why it is not recognised by Google.

Goals:
- Improve search engine rankings on Google
- Increase organic traffic to the website

Skills and experience:
- Proven track record of improving search engine rankings
- Knowledge of Google's ranking algorithms
- Experience with off-page optimization techniques
- Ability to conduct keyword research and analysis
- Familiarity with backlink building strategies

Keywords:
- The client has specific keywords in mind that will be provided for optimization.

Please provide a brief overview of your SEO strategy and how you plan to achieve the goals outlined above in your proposal.