They say that nothing in life is free. Supposing that is true, that does not mean that the only currency with which we can pay for life's things is money. Many have paid for freedom with their lives. Others have sacrificed comfort or promotion or better lives for themselves to benefit others. They have paid the price of whatever that thing is with a currency other than money. Blood, sweat, tears, dignity... all forms of currency.
However, the simplest and most overlooked of these alternate currencies is kindness. Returning kindness for kindness is often the greatest repayment one can offer.
Good deeds are most often not done with the expectation of repayment. But there is nothing wrong with offering kindness in return anyway. When you are the beneficiary of the goodness of another, be grateful, say thank you, do something nice in return. It could be as simple as opening a door, or helping carry groceries or baking a pie.
Kindness is always welcome.