Up to this point, you've had to go to either Camp, Town, or God Temple to speak with someone who then opened a new quest for you. Ptah line is no different.
🐫 Unable to Unlock a New Location?🐫
Here's a list/chart of Egyptian Quests. If you scroll down to the most recently completed location, the next row will tell you who opens the next one for you.
For additional reference, this game has a pattern of ALWAYS needing to speak to someone, somewhere in order for new locations to open. Though the pattern can vary, seek out speakers in:
Town. Camp. Temples of the gods (even previous.) WITHIN previous mines.
Hope this helps☺