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A person should always focus on gratitude. When we focus on all of the kindness that Hashem does for use open up new channels of Bracha. We gain the ability to see that life is not about me, and to develop humility. The middah of humility is one of the best ways to acquire Torah.
The more that we thank Hashem and see the greatness of his presence, the more that we live on Hashems terms and not our own. When we face the true reality of the world and accept it as it is, we gain the ability to grow. Gratitude brings us to Teshuvah more then anything else. The more we see all of the good things that Hashem does for us the more that we will want to return to Hashem.
Saying a Bracha with Kavanah is a powerful tool for developing simcha. The key to happiness is being happy with what we have. Many people translate "Samaech B'heilko" as being satisfied with what we have, but that is not the correct translation. The correct translation is Happy with what we have. If we want to be "rich" we have to be happy with what we have, and the key to that is gratitude. When we have real kavanah when we say a Bracha we are increasing our gratitude and building up our Simcha.
Rav Gifter asks why is it that Hashem tells us to be happy with the good that he gives us. Wouldn't it be a natural reaction to be happy. The answer is that it is the natural reaction of man to want more. In order for us to be happy we have to work on being grateful for the good that we are given. At any given moment we are deciding 4 things: our thoughts, our feelings, our words and our actions. By focusing on these, we can elevate ourselves and be happy.
From the Yom Tov of Tu B'av we learn Hakaras Hatov (gratitude). One of the reasons that Tu B'av is a special day is that the victims of the masacare of Baitar were allowed to be burried on Tu B'av and they had not decayed. One might say, "that's a blessing, a blessing would have been if they had not been murdered." Our Rabbis wanted us to know that we do not thank Hashem only for the big things, we have to thank Hashem even for the good in the bad.

