u/8-bit-Felix

Okay, not specifically a shower thought, I was stuck in traffic, but you get the idea.

The ending of Pyramids shows an old, tired Dios being thrown back 7,000 years in time to meet Khuft the camel header (I hear big things are on the horizon for this Khuft guy).

This isn't Dios's first rodeo. Hells, it isn't Dios's thousandth rodeo.
Dios does this forever (almost), and eventually Dios will bring the downfall of Djelibeybi.

See, every time Dios goes back to the beginning he brings with him all the knowledge of the kingdom.
The problem is Dios is tens of thousands of years old and even with the pyramid revivification his memory is being steadily worse.

Dios himself admits he struggles to remember scraps of information and technology and covers for the lapse of knowledge by inventing new gods on the fly for copper wire when there's already a god of the forge.
It can be speculated that there are multiple gods of the sun because Dios simply forgets he created Cephnet earlier and created Gil a few hundred years later.

Eventually Dios's mind will fail in some vital way and he'll forget something important like forging bronze properly or some vital bit of agricultural knowledge and Djelibeybi will steer off its normal historical course.
If this happens the country will no longer be able to properly defend itself from an upstart Tsort and Ephebe and get swallowed by one of its neighbor empires effectively killing the country.
Only then will Dios find peace and either die or continually live forever going to his pyramid nightly.

Yeah, it was a long traffic jam.