1. 3000 is just a place number.
2. I need feedback to continue writing in an SCP style.
Thank you all for you time and criticism.
On a positive note, the tone isn't bad, and you've got a decent balance of length-to-content here. There are some grammar mistakes like the run-on sentence in the containment procedures, but nothing a little proofreading couldn't fix.
Now for the bad news: I could go into depth here, but really my critique boils down to one thing: It's a stock take on an idea that isn't very strong to begin with, and has been done before in a very similar way to boot. That will torpedo an article like nothing else can.
What you have here reminds me of SCP-270, but where that one has a number of nice subtle touches that save it from being just another creepypasta-esque Series I, this has a generic "mysterious creepy guy that knows about the foundation". (That's a designation that probably has its own filing cabinet in the POI records by now.) 270 isn't perfect, but what it does right is something to learn from: It's a voice on a phone that talks about random stuff and makes creepy noises sometimes… but it's also a modern reinterpretation of a classic "tome of eldritch lore". It's a honey trap: it gives out just enough useful information for the foundation to keep throwing fresh researchers at it when the previous ones have been sucked dry of sanity. And then the voice has its own breakdown and seems to be replaced. A simple idea becomes something complex and twisted- and that makes for a cool SCP.
So long story short, what I'd suggest is finding a stronger base idea to work with rather than trying to force this one to work.