If you're having trouble interacting with the valve during the quest ‘The Wound in the Sand’, make sure you follow the quest sequence correctly. Keep in mind that the valve is timed, meaning you have a short window to interact with it after pulling the lever.
For more detailed instructions, you could look up a guide or walkthrough for Horizon Forbidden West - The Wound in the Sand.
If you still can't interact with the valve, try loading a previous save from before you entered the valve's room.
Additionally, if Jetakka does not move when you're supposed to follow him at the beginning of the quest, load an earlier save from before you started the quest.