Why have people written dairies since ancient times? They reflect on their life, document what happened to them and what they made happen. They learn from their past but reading past memos and notes. According to success scientists, people who work with a journal are more successful in life.
That`s why it makes sense to have a sales journal in place. You must not write a novel every day but note what was good and whatnot, what worked and why. Where you failed and why. All the good things that happened today and the fun you (hopefully) had in sales or with your job. You should not add details of a dull day or period, but only valuable and worthy information about your job. It is up to you to keep it long or short. But it will definitely help you to increase your sales quota!
After that, you should fill your to-do and personal goal list with the learnings from your sales job. Use the most comfortable way for you to handle it. It could be in the cloud, as a desktop dairy solution, written in a leather-coated journal, or whatever you want.