What does the word "blessing" mean to you? There are several definitions of it, but how I'm using it here is that it means "approval or good wishes."
If you think back over the course of your life, who comes to mind as someone who gave a blessing to you? It could have been someone close to you who believed in you, or encouraged you, or challenged you, like someone from your family, or a good friend, or a special teacher who saw the potential in you. Maybe it was someone who supported or encouraged you as you went through a difficult time in your life. Or maybe it was just someone who briefly passed through your life who was thoughtful and kind in a moment when you needed kindness. Make a list of as many people as you can recall; and then notice what happens to your energy level and your feelings of well-being as you do that.
Even if they never actually said specific words of blessing to you, but their actions and attitude conveyed their approval or good wishes for you, what would have been the essential message they gave you? Would it have been something like, "I believe in you," or "You matter to me," or "You can do it," or "I'm with you," or "I like you for who you are?" What would those words have been? Write them down next to the names you put on your list.
You can do the rest of this exercise in two different ways, so do whichever way appeals to you the most:
The first way uses your imagination: Imagine a circle of chairs set up in a place that feels peaceful, beautiful, and safe to you. See yourself sitting in one of the chairs. Then imagine inviting those people who have blessed your life to come and sit in a chair. Use however many chairs you need. Then one at a time, imagine looking at each person and hearing them speak their essential message to you. What was the look on their face? How did their voice sound? What was their body language like? What energy did they convey to you? Imagine receiving their essential message, and when that is completed, move to the next person. As you imagine going all the way around the circle, let yourself really take in and absorb what their messages would have been to you and feel how good it feels to recall and receive their blessings once again.
The second way may work better for you if you are not an internally visual person and would prefer to work in a more concrete way. If so, then draw it out on paper, with a circle representing you in the center of the paper, and small circles forming a larger circle around you, representing each person you would love to invite to your blessing circle. Write their name inside their circle, and next to that, write out what would have been their essential message to you, whether or not they actually said the words out loud. Continue drawing circles and writing out essential messages until no other person comes to your mind. As you do that, hear their voices in your mind. Allow yourself to receive again the positive intent they had for you and feel how good it feels to recall and receive their blessing once again.
What happened for you emotionally as you thought of those people and let yourself recall the blessings they gave you? The idea behind this exercise is to re-activate pathways in your brain associated with feeling good, joyful, blessed, and as that occurs, to de-activate neural pathways associated with negative feelings.
The long term idea is to rewire your brain for greater happiness. Since we now know that repetition builds and strengthens neural networks, every day this week, either take some time to re-imagine your circle of people who have blessed your life or review the page on which you drew your blessing circle. Seek to hear and internalize their messages to you again and again until they feel true.