How did the Buddha define success?
The Buddhist goal is Nirvana and on jet to reach it is called a Sekkha. Success comes then you have reached the goal and free from all stress is accomplished (Asekkha).

Even you are are not fully accomplished, the practice may help you manage your day to day stress, until one day you do not get stressed any more.

Also do not procrastinate doing the tasks as this is the last day or moment. This would help in your worldly aspirations also.