Be more bold.
I was like you, very ambitious. Started with a cube, after many attempts getting nothing saw something incredibly vivid, very much like lucid dreams that I've had when I was younger.
And then three months of nothing again.
I got SO EXCITED. It's there! I was right, people condition themselves largely, into a form of acceptable experience. But there is more.
So I took smaller steps. A point. A spot of magnitude. Add color. Add one more spot, at a measure from the first. Rotate that around, then rotate that in three dimensions. Trace letters, one by one. Read backwards the result. Light a surface, texture a surface, bend a surface.
The smaller the steps the more success you'll have. It's important to feel grounded, and it's important to be motivated to invest the time. Success is non-negotiable, it has to be there.
Frustration is the mind killer.