Try something new / Rediscover an old interest.
Take on a different responibility at work or home.
Sign up for a course you have always wanted to do.
Learn how to cook your favourite food.
Set a challenge that you will enjoy achieving.
Fix a bike, learn how to play an instrument or how to draw.
It does not need to be a big project - Learning something small is just a good. You have heard the saying "We learn something new every day".
Learning new things will make you feel more confident. This will help open your mind to new ideas as well as having fun!