Hi,
It sounds like you require an SEO audit to identify what's going wrong and to recommend a plan of action.
I carry out white hat SEO work and would be able to assist you.
My bid would be to carry out the audit, providing you with a complete report of my recommendations.
To give you an idea of my approach to SEO, I have included a private message, which includes details of how I carry out work.
Kind Regards,
Keith