Hang wet towels around... make sure any pot of water you have in the tent is wider than it is deep (more surface area = more humidity)... if you have room, add a humidifier - this one is only - https://smile.amazon.com/raydrop-Humidifiers-Whisper-Quiet-Ultrasonic-Humidifier/dp/B09249VR2T/ref=sr_1_5?crid=2Q5DPXITTACM8&keywords=humidifiers%2Bfor%2Bbedroom&qid=1653826972&sprefix=humidi%2Caps%2C100&sr=8-5&th=1
Good luck!