I only know that bitcoin price always changes in every time and I think it is not a bubble but it is normal. bitcoin price changes because people want to buy and sell bitcoin at any price and it makes the price is up an down in any second. but sometimes the price will increase higher than the price now and will make a new highest price and then it will make a correction price. so if we can see this as a chance to buy bitcoin then we can make a lot of profit and we can sell at the highest price.