It's not as prominent in her other series as it was in Throne of Glass, but SJM almost always includes ways that small acts of kindness can save the world.
Feyre giving a starving Water-Wraith all of her jewelry so they can buy food and pay their tithe and they saved her and Amren in the summer court. She didn't ask for anything in return, but she knew what it was like to see your sisters starving
Rhysand's mother saw two vulnerable Illyrian boys and took them in to raise as her own and they grew into two of the strongest Illyrian warriors to exist, but more than that, Cassian, Azriel, and Rhysand became each other's moral centers and the three of them defended the defenseless and saved Prythian in more ways than one
Feyre told Amarantha her name to save Lucien from being punished and the Lady of the Autumn Court helped her finish her impossible floor scrubbing task
It's the small acts of kindness that have the biggest effect