Choose what you love to do
To regain back the high spirits, you need to be happy and happiness comes inevitably when you do what you love. Only you know, what can make you happy. Therefore, do not just think about your dreams, instead step forward to fulfill them.
Love what you do
However, every time you cannot do what you love, instead you have to love what you do. Negative attitude towards something makes your efforts go in vain even before you start doing it. Therefore, focus on positive sides and associate only positive results to doing that task. Looking at the sunnier sides can make you love and excel in your work.