Personally buying a new piece of clothing that I love will immediately bring up my spirits. Walking around in something you feel good in will without a doubt help your confidence, and your mood. If you're feeling stressed and unmotivated and have been eyeing a certain thing for a while, go out and buy it! Now, if you're struggling with money don't go buy something you can't afford, but if you've been saving a bit of money, go for it.
Nothing is better than boosting your mood and confidence by treating yourself once in a while! Life is hard for everyone, and you all deserve to get a little something you want every now and then!