Step-by-step you go about it like this:

Set your goals

Establish clear objectives and goals against which you can measure your success/ return on investment (ROI).

Your marketing goals should be

• specific,
• measurable,
• attainable,
• relevant and
• time-bound.

Then, to show you how wel your strategy is working, track meaningful metrics, not the number of followers and likes, but

• Reach (the number who see your content)
• Impressions (the number of times people saw your content)
• Audience growth rate (how many new followers within a certain period of time)
• Engagement Rate (how many interact with your posts)
• Amplification rate (the ration of shares per post)
• Virality rate (exponential growth)
• Video views (how many watched your video)
• Video completion rate (how many watched it to the end)
• Customer satisfaction (CSAT) score (how many react positively to your survey asking them to rate your service)
• Net promoter score (NPS) (customer loyalty)
• Click-through rate (CTR) (how many click on your link for more)
• Conversion rate (how many posts lead to a subscription/download/sale)
• Social share of voice (SSoV) (mentions, either direct or indirect – tagged or untagged)
• Social sentiment (are the mentions positive or negative)