Try to generate the sitemap again using the tool and then replace with the new one. Without checking the file it is hard to pin point the issue.

Try to use 1 H1 tag per page. In your website home page, there are 2 H1 tags. This might be confusing the search engines.

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If he removes all the errors in that price, then deal is not bad. Me and Emmanuel Katto paid $310 for the same work.

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This is an audit from Ahrefs. A little bit of work with site structure and content. Can't comment on price but if he can fix it for you to no errors, it does sound fair.

Use related link building practice. Now Google is smarter enough get links from anywhere you want but must be related to your Niche/Topic.

This can be helpful to you, https://moz.com/beginners-guide-to-seo