Although it seems completely contradictory, allowing yourself to make more mistakes may actually reduce the number of mistakes you make on a regular basis. Here's why.
Dr Heidi Grant Halvorson, writing for Psychology Today, argues that making more mistakes will result in making fewer mistakes in the future. Why? Assuming you actually learn from those mistakes, you'll develop habits that help you prevent them. If you start something new with the mentality that you're going to screw up from time to time, and give yourself permission to do so, you can use those mistakes as moments to learn and get better.
Why Letting Yourself Make Mistakes Means Making Fewer of Them [Psychology Today]