I agree with you that we all know that cryptocurrency is highly volatile because it's prices can increase in one day and can decrease in other day depending up on the market conditions so fluctuations are must if I summarize it so that's why for the prediction and for the indication of these fluctuations there is a method that we use which is Fibonacci retracements.

Whenever we talk about word retracements then it is always meant by fluctuations in market as well as I totally agree with you that most important Fibonacci retracement levels is 38.2% as well as you have tried to best to implement Fibonacci retracements at BTC/USDT chart in which you are sharing a 30 minutes frame with us.

If I start from top of your post and if I and at bottom of your post then everything is truly understandable to me and there is nothing which is confusing me so I must say that it's a comprehensive and basic knowledge that you have shared with us regarding the topic Fibonacci retracements. I wish you good luck and success in this engagement challenge