You don't "join" the Illuminati. There's no nomination or application process. That would be like asking someone else's permission, and what kind of Illuminati would have to ask permission?
If you want to be Illuminati, decide you are Illuminati. That's it.
In other words, it's far more difficult than you might have been imagining. You can't buy, bargain, or bluff your way in. You can't fool yourself or lie to yourself or wonder or guess or doubt. Most of all, you can't pretend. Pretending to be Illuminati would only mean you're not actually Illuminati. You have to know that you are without a doubt Illuminati. Whether you are the only Illluminati, or whether everyone is Illuminati but few realize it or admit it, or whether the truth is something in between, you have to be as certain of your own standing as Illuminati as you are of your own will to move your own hands.
In short: you must master your own mind. If you can't do that, you can't hope to control anyone else's. If you can't do that, you can't be Illuminati.
If and when you become Illuminati, will not be contacted with instructions. What kind of Illuminati would need instructions from someone else? You will not be aided or supported by the organization. What kind of Illuminati would need aid or support from someone else? You will not have the meaning or secrets or goals of the Illuminati revealed to you. What kind of Illuminati would need to be told such things by someone else?
Understanding this is the first step, but if you think real understanding can come from my words, you are not yet Illuminati.
I'm rooting for you. May you find the light!
Respectfully,
Myriad