Many studies have been done on the powerful effects of gratitude.  Greater Good in Action (https://ggia.berkeley.edu/#) has a practice they call "Three Good Things".  Three Good Things invites people to write down three things that went well during the day before going to bed each night.  After you have written down these three items, you are invited to think more deeply about this by writing down "why" you are grateful for each of these things.  As you fall asleep, your mind focuses on those items of gratitude.  As you go through the next day, become aware of things you are grateful for in preparation to writing them down before bed.  That evening you write three different things you are grateful for along with why you are grateful for them.  As you go along you are remembering the things you listed the night before and consciously looking for three more things you are grateful for to add to the next night.  Making a habit or daily practice out of this has been shown to improve mood.  I invite you to give it a try and see what you think. 

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The infographic below from University of Michigan was designed for healthcare workers, but seems to apply for many people.