How to write an evaluation of current online marketing strategy?

I need to evaluate the current acquisition strategy of a potential employer and I ‘m struggling with how to present my thoughts, how detailed should I get? I don’t want to give them a marketing plan (why hire me then?) but I do want to illustrate in a concise way what I think they can improve on and how I can help them do it. Any suggestions/resources?

You can give them the step or technique how to promote their business online.. Sorry, If I’m not answer your question.