Neville and other loa teachers often say "identify with the Inner Man" and that's not without reason. Everything else is secondary; a tool. Affirming, visualizing, sats, the void. Literally everything. They're all tools to help you identify with the self you want to be. That self is in there, but the more you deny it, the harder your journey will be.
Learn to identify with the Inner Man. Allow yourself to live in imagination and the 3D will follow.
The reason I say this is because so many people will claim that they're doing every single thing they can to manifest but still not seeing results. They'll affirm thousands of times a day. They'll visualize while in sats. They'll ignore the 3D and flip their thoughts. Meanwhile, throughout all of this, they're still identifying with the Outer Man. They're still identifying with lack and unfulfillment.
I promise I'm not trying to be mean, but it's not surprising to me that so many people have trouble with manifesting when they outright refuse to identify with the self they want to be. If you want to be rich, identify with that rich self. If you want to be the smartest person in the world, identify as the smartest person in the world. Why would you identify with a version of yourself that isn't what you want to be?
Things like affirming and persisting are tools to help you identify with the Inner Man. They are not the end all be all of manifesting. You can manifest without affirming and visualizing and doing 100 backflips if you immediately identify with the Inner Man and stick true to that. However, if you continue to identify with the version of you that lacks and desires with no fruition, which version do you think is going to manifest?
