Humans built the pyramids — no aliens, no magic, just a lot of work. There’s not the slightest evidence of anything else.
The pyramids are amongst the stupidest structures ever built by humans. Their only distinguishing property is their hugeness. They are not useful, or demonstrate some interesting new architectural ideas, or provide a space where people can meet or see performances or do work or make art. They are the simplest possible organized building — literally a pile of rocks which does nothing except “be very big”.
(I visited the amphitheatre at Ephesus once. It was glorious — much of the city could have sat there, and the acoustics would have been amazing. They must felt like kings of the world, and in many ways they were right.)
People had been making huge piles of rocks like the pyramids all over the world for literally a thousand years before that, and these were bigger, wow, dickmeasuring being as always a huge motivator for action.
The only argument you present for anything abnormal in the construction of the pyramids is that you cannot figure out how it would be done, and are unconvinced by anyone else’s explanation.
That’s no evidence of any chicanery. Humans built the pyramids using their own muscles and the muscles of animals as power, using a few simple machines like the inclined plane, the wedge and the lever — even if you can’t figure out the exact details.