I've done some minor editing on Dear Tanjiro, mostly on the last chapter, but if you want to read the new, fresher version then feel free to do so.
Something that might be funny to know is that when I wrote it two years ago, I sat in biology class. Those classes always bored me to death so I wrote Dear Tanjiro at the same time as Dear Izuku to pass the time, hence how bad it was and why I've now edited it.