Hey buddy :-) The perfect temperature is 18-26 C :-) It could be the temperature, but it could also be that it is a bit much has water?
there is a very simple trick when you give water. Let it dry nicely, then lift the pot up and remember how easy it is. Then pour it and lift the pot back up and notice how heavy it is now. The next time you water, you will only do it again if the pot is as light as when you started. As a pure beginner, you can also use a scale and note the weight ፦). Keep carrying as before 👍 Your plant is beautiful