You may rest and pray to the Divinity Statues to restore your Stamina at the Altar of Ennoblement.
First choose a room, click on any statue, then click “Begin Cultivation” to enter a state of cultivation. You will receive 1 Stamina point every 2 minutes. Cultivation will stop automatically once the cultivation countdown ends or the number of obtainable Stamina points reaches zero. If cultivation is interrupted, cultivation time and points will be saved for future visits.