Make a list of every specific task that you should do but aren’t doing because of fear or lack of confidence or lack of ability.
Pick one of those tasks.
You can pick the one least threatening to your comfort. The point is that when you do something outside of your comfort zone you will grow. You will grow in confidence and in skill. You will feel empowered to do another.
Or you can pick the one most threatening to your comfort. By choosing one you are eliminating the others and you lower the combined fear factor. If you tackle the most threatening task imagine how much more confidence you gain for taking on the remaining tasks.
The key to stepping out of your comfort zone is to take one step. And then another step.