The signature is the beginning, not the end
A contract does not create a customer. It creates a promise that the next 90 days will either confirm or cancel.
Most sales teams celebrate the signature, move on to the next deal, and assume the relationship will take care of itself. The data says otherwise. The probability of renewing a customer who was not actively onboarded in the first 90 days drops by more than 60% in most B2B segments. The probability of expanding that account drops even more.
The book After-Sales, Renewal, and Expansion argues that the sale is the cheapest moment of the commercial relationship. Acquiring a new customer costs 5 to 7 times more than retaining an existing one. Yet most organizations invest the opposite proportion: a sales team focused on logos, and a customer success team focused on tickets. The strategic work in between — the routines that turn a contract into a partnership — is left to improvisation.
That is the gap this book fills.
What the book covers
The book is organized as a 15-chapter operating manual. Each chapter is a routine you can apply next Monday morning, not a theory to admire on a shelf.
The first part covers the transition from sales to delivery: how to hand off without losing context, how to align expectations, how to design an onboarding that produces measurable adoption in 90 days. The second part covers the ongoing work: follow-up meetings that create value, not status updates, and how to demonstrate realized value when the customer is too busy to notice. The third part covers retention: how to read the warning signs of churn, how to rescue an account that has already decided to leave, and how to prepare a renewal that does not start 30 days before expiration. The final part covers growth: how to discuss contract adjustments without breaking trust, how to recognize expansion signals, how to upsell with appropriateness, and how to turn happy customers into advocates who bring new business for free.
Who this book is for
This book is written for three people. The first is the salesperson who wants to stop chasing new logos and start building a book of business that renews itself. The second is the customer success manager who wants a system instead of a series of fires. The third is the founder or commercial director who has realized that the next stage of growth will not come from more leads — it will come from extracting more value from the customers already in the house.
If you have ever lost a renewal you thought was safe, if you have ever felt that upsell felt pushy, if you have ever been told by a customer "we are not using it much" six months after signature — this book is for you.
How to read it
Each chapter is independent. You can read them in order, or jump to the chapter that solves the problem in front of you right now. Every routine is described with the script, the timing, and the failure mode. The book does not try to convince you that after-sales matters. You already know that. It tries to give you the operational language to do it on Monday, with the customers you have today.
Frequently asked questions
What is after-sales in a B2B context?
After-sales is everything that happens after the contract is signed: onboarding, adoption, follow-up, renewal, expansion, and advocacy. In B2B it is the single largest driver of revenue growth, because the cost of acquiring a new customer is 5 to 7 times higher than retaining an existing one.
Why is the first 90 days after signature so important?
The first 90 days determine whether the customer experiences the value they bought. If they do, renewal is a conversation. If they do not, renewal is a rescue mission — and most rescues fail.
Is this book about customer success or sales?
It is about the overlap. The routines in this book sit between the moment the sales team wins the deal and the moment the customer success team takes over. Whoever owns that overlap owns the next three years of revenue.
Do I need to read the chapters in order?
No. Each chapter is a standalone routine. You can read them in any order, or jump to the one that solves the problem in front of you.
Where can I get the full book?
The complete book is on Gumroad, with 15 chapters and 16 country-specific editions adapted for English, Portuguese, Spanish, French, German, and Italian-speaking markets.
Conclusion
The sale is the cheapest moment of the relationship. Everything expensive — retention, expansion, advocacy — happens after. The companies that win the next decade will not be the ones with the best leads. They will be the ones with the best after-sales routines.
The book gives you those routines, one chapter at a time.
Buy the full book on the store | USD 5
About the author: Reginaldo Osnildo is a journalist, professor, and author of works on sales, technology, and communication strategies. His work connects academic research, practical business experience, and storytelling to deliver clear, didactic, and applicable knowledge.
Photo by Ketut Subiyanto on Pexels.
Comments