Plan a debriefing session

Always debrief your sales calls. This is the only way you can get better. Ask yourself:

What went well?

Where did I run into problems?

And what could I do next time to get even better results?

This is absolutely the only way you will improve. Sales is a grand experiment — customers change, markets change, your offerings change, and so does your knowledge base. Unless you're continually learning, you're losing ground.