A marketing strategy is the process of achieving business growth by reaching, engaging, converting, and retaining new customers through an understanding of their problems, and helping them to find a solution through marketing content, activities, and campaigns.
Like any well-defined strategy, a marketing strategy defines:
What business outcomes you will achieve,
What marketing activities you’re going to do, when and where you will do them
Why you’re doing those marketing activities vs. others
How you will achieve those results
Who you are targeting (your ideal customer profile)
Who is responsible for performing each activity (internal, agency, freelancer)
How you will measure success and how much it costs (budget)