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I have a word document where teenie-me collected all the remarks on her animexx fanfic. This document is almost 20 years old.
I wouldn't delete it if you put a gun on my head.
(I lost the story eventually, but you can be sure I still have the comments xD)
"I didn't comment on a fic I liked because I don't think the author would care or remember my comment anyway". fanfic writer here, I still remember comments I got on my fics from seven years ago. I still think about them and they still make me smile. your kind comments are what motivates us and what helps us keep writing.
I personally know writers who take screenshot and print out comments they got from their readers.
TL;DR comments matter to us writers more than you think. if you like a fanfic, never be shy to let the author know ♡