What is your budget, what is your site, do you know your target keywords, have you done keyword research, are you looking for an ongoing service, or simply a report which analyzes your site and provides suggestions for improvement? More details are needed to be particularly helpful, however if you give me your information I can provide you with a complimentary consultation and analysis of your site.
Your keyword density is very high google now accepts keyword density 2-3% so kindly change it , and invalid security certificate. use valid security certificate. your website automatically will be on TOP again.