I have tried this simple yet powerful process with one of my good friends and colleagues. Whenever I used it, it brought improvements to various areas of my life.
Write down several questions that cover the most important areas of your life, like sadhana, service, relationships, self-renewal, finances, etc. Questions may be something like this:
Did you chant your rounds attentively today?
What services have you done for Krsna today?
Did you read Srila Prabhupada's books today?
Did you glorify Krsna today?
Did you take care of your body well today?
Send the list of your questions to someone you trust and ask him to ask you every day or so. These questions will be like your daily compass. They will help you assess whether you live by your values.
Try it and see how it improves the quality of your thinking, your actions and ultimately, your results.