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As much as I would love to say something like “kudos are just as good” or “Count your blessings, every kudos is someone who loves and appreciates your work” I feel this more than I could ever preach that.
Srsly, comment on your favourite fics, let the author know that someone sees their hard work and appreciates it.
Let them know their work made you feel something, anything at all.
Don’t be silent, or your favourite authors will be.