Question

I'm writing a persuasive letter to my parents for class what are the mean things I need to make my letter persuasive?

Answer 1

Try to use this scheme called AFOREST

A-alliteration
F-facts
O-onomatopoeia
R-repetition
E-emotive language
S-statistics
T-the rule of three


Also try to hook the reader with retorical questions

Answer 2

Well, first off, persuasion itself means: "the action or fact of persuading someone or of being persuaded to do or believe something." So, making a persuasive argument means you're trying to make them believe the same thing as you with this letter. Use words that you think are persuasive. :)
~Mistermistyeyed.