I don't understand the question.

You can do anything you want (although you should be aware and willing to accept any consequences of any choices you make).

There isn't much in life that you should do.

In general, human beings need a certain amount of nutrition, water, and sleep to survive.  Therefore at a minimum, I'd suggest that what you should do is:

Eat food.
Drink water.
Sleep.

Beyond that, it's up to you.