Website tidy up and fix SEO errors

I am looking for a skilled freelancer to help me tidy up my website and fix any SEO errors that may be present. Specifically, I want to focus on SEO optimization to improve my website's search engine rankings. I need someone who is experienced in identifying and addressing SEO issues such as broken links and slow loading speed. While I do not have a list of specific keywords to target, I have a general idea of the industry and need help identifying the most effective keywords to use. I am open to a flexible timeframe for completing the project.