Storytelling reveals the value you offer through an example (the story) rather than through claims. Along the way the story shows the power of your product, your experience with real-world obstacles faced in realizing that value, and your reliability as a partner in helping overcome those obstacles.

The central character, your customer, has a big and easily relatable goal, maybe enabling wireless communication in remote areas or enhancing car safety. You were able to help them realize an important component of their goal through the capabilities of your product and your expert advice and help.

The story should follow a realistic but abstracted path drawn from experience with other customers: their goal, their challenge, and the role you played in helping them meet their goal. One example only. Memorable stories don't have multiple plots.

Spend time detailing the challenge and obstacles, a challenge not simply met when you wave your product magic wand. There are roadblocks and potholes along the path. Talk about how together you overcame these problems. This adds credibility and builds trust.

Overcoming first obstacles often brings the customer to new obstacles. The prototype solution worked but it falls apart under production stress. More collaboration is needed to get past this problem. Building more trust.

Finally the customer was able to deploy their new solution in production, meeting their objective. At the same time, they gained a new trusted partner (you).

How detailed you can get may be limited by time or space constraints, or how much you know from other engagements, but try to hit the main points. In blogs I aim for 800-1000 words, split into three main sections. 

These aren't unbreakable rules. You can adapt as needed. But you should still stick to telling a story, showing by example.