Even with semrush it is possible to do audit of each page. Its time taking but its possible

write your content on less competitive keywords and check which pages of your competiotors are performing better. You can create same pages with smart strategy and add more useful information that your competitors dont have.

Yes, many people are providing the best SEO service on Fiverr, but it also depends on how you select the right one for you. Most people have limited knowledge, and they apply strategies that give you short-term results.