Santosha is the second of the five Niyamas and it means contentment. To practice Santosha does not mean to be content with everything and for that reason not seeing a reason to do anything. The way I see it, it’s more about finding accept and not leaning your peace and happiness towards external factors.
For example, if you find yourself in a bad situation and you get stuck in ‘had I only done this!’, or ‘It would have been so much better if..!’ you can practice Santosha by accepting the reality, which in this case would mean to let go of the alternative universes you keep imagining. It’s first when you accept what is you have the power to change it. Why would you change it if you are content you may ask. Well, to be content with something does not necessarily mean you like it. You might be content, because your inner peace and happiness is not disturbed by whatever is happening, but that does not mean you sit and watch while bad things happen.
So the practice of contentment is to find gratefulness over the things you have. The deeper the practice, the less you need to in order to tune into gratefulness, where the ultimate goal is to find gratefulness in simply being alive. When being alive alone is enough to fill you with gratefulness, you will have no problem feeling content in any situation. Your actions will no longer be compulsive. You will simply act on what’s the right thing to do, rather than the thing that may give you the best boost.
Remember, you came into this world with nothing and you will leave with nothing, everything in between is just a big bonus. Be thankful for it!