The interviewer wants to know how you plan things in the first 30 days because you are in the spotlight as you are a new employee. Everyone is expecting results from you. If you promise great results to the hiring manager it won’t do any good. Instead of it you can say this.  “In the first 30 days of starting my employment with your firm, I would focus on mending the mistakes and planning strategies that can get results in long term instead of focusing on short-term results.  I would perform all the content audits and competitor analyses to plan strategies that would drive results. Also, I would try to update the previous content in these 30 days.”  This is a more realistic answer to this question rather than promising results.