What's the noun for quixotries? Here's the word you're looking for.
quixotism
That form of delusion which leads to extravagant and absurd undertakings or sacrifices in obedience to a morbidly romantic ideal of duty or honor, as illustrated by the exploits of Don Quixote in knight-errantry.
“This was an opportune moment to address the issue of the oppression of animals, until then catalogued in the annals of quixotry, as a serious moral problem.”
“Perhaps the explanation of Picasso's quixotry can be found in something he said to the writer Giovanni Papini in 1952 Todayas, as you know, I am famous, I am rich.”
“She knew that her brother was capable of any quixotry, any excess.”