So yesterday i started to train my plant and today...

hi there so you have three problems. first of all overwatering, you can see from the "puffy" space in between the veins of the leaf and the wrinkled leaves that you're overwatering , this will actually shock the plant a slow growth. to fix this problem you should simply follow a strict wet/dry cycle. you need to find a better solution for how to see if you need to water or not. See the " lifting method " for when to water. Second problem is: your VPD is off. vapor pressure deficit is what regulates metabolism and metabolism is what regulates plant growth. You will want to basically raise your temperature and humidity, just get a cheap space heater in there! Third, and this the easiest problem, just water with water that's warmer at 21°C, this will trick the roots into thinking it's warmer than it is and will stimulate growth. hope this helps ! 🚀