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Hi there I answered a similar question recently in another Q+A thread - you can read that here. But, if that's not possible for knowledge or resource reasons, some of the above will require a professional and technical expertise. I highly suggest you take advantage of the Recommended Companies from Moz - there are a TON of experts there that can help you take care of these issues if you're not equipped to do so yourself. If you are interested in learning some tactics yourself, Moz has a great learning section to read through - it will help you immensely going forward. Hope this helps! Good luck!