So, is there still no way for us to predict the top and bottom of the trend?
No one can predict the price of bitcoin for no one controls it, also its value depend on the supply and demand. We can just have a wild guess whether it will go up or down.
You may want to give a look to the technical analysis of a lot of traders, which you can find on this website:
https://www.tradingview.com/symbols/BTCUSD/The all differ in their conclusions, proving that it is impossible to make predictions which surely will become true, but some of the analysts seem to get it right more often than others.