Wordpress SEO - Optimizing \"another wordpress classifieds plugin\" - repost

I am running a small classifieds platform with public posting functionalities. The platform is based on Wordpress with the "Another wordpress classifieds plugin (AWCP)". I rely to attract a maximium of traffic through search engines. The site is fully working, up and running but is suboptimal from a SEO perspective, as all the posts are excluded from the sitemap.xml. Thus I would like to hire an experienced Freelancer or Student who knows how to adjust and customize Wordpress Plugins in PHP in a way which optimizes the SEO outcome. The following tasks need to be done: Individual Post Page - Title in Browser - needs to show the title of the post and country as well - Title - for some reason is not put in H1 tags (needs to be put in H1 tags) - Need to add an option to add Categories (similar to blog and page pages) - Meta Keywords need to be added (based on those categories) - Meta Description - recheck that this is correct (it should be, but I would like to have this rechecked) - Any other META or other entry specific to the post site which helps from an SEO perspective XML Sitemap - needs to index also all individual postings (for some reason does not do it as they are not part of the normal blog or page pages of Wordpress) Other - recommendations and suggestions how to further improve the website from a SEO perspective Conditions - Freelancer needs to show reference projects and credentials in Wordpress SEO - I will provide access to the testserver, Wordpress Admin environment and FTP access. - I expect this to be max. a 10 hour job - I can give clear guidance which pages I believe need to be adjusted.