Creepypasta and The Problems that it seems to have

Derek's Suicide LOST EPISODE blog edition damn Daniel back from the grave

by MrCreepyPasta

I agree for the most part, but I disagree with avoiding cliches. Cliches aren't inherently bad. There is a reason people keep on using them, after all. But cliches need to be done WELL for it to have an impact. As you said, tons of cliches are used, but if it's done well and it helps the story, there's no reason to avoid them. Think of Undertale for instance. It's not particularly original, with the whole "seeing everyone you care about die because of you" trope, but the way it's executed really helped drive the narrative of the game home.

I have a couple counters.
1) there are people who write Creepypasta as a comedy. I don't see the tips on how to do those.
2) I agree with your catchphrase rule, though I will mention a little repetition of a certain word or phrase may work depending on how important it is and who's saying it. I'd recommend only doing this in the first person, or a third person with a certain dialect or accent.
3) I noticed in your blog you're capitalizing the first letter of a couple words. Rules of the Caps say it only works for the first letter in a sentance, a name of a person, place and/or race, and all caps to signify yelling.
4) Happy endings are sometimes attainable, depending on what is lost or gained. It has to somehow work. Like in "A haunting in Connecticut" though their house burned down, Matt unusually lost his cancer. Maybe it was thanks for freeing the ghosts? Maybe ridding them restored his life? Maybe it was a coincidence or a missread, or something we can't explain.
5) Consistency in other character's grammar and accents will work in your favor.
6) Consistency in perspective really helps: Best not to jerk the reader around with constant perspective-shifts.