TA can't really be used to determine the market fully because the crypto market is very volatile and it is very difficult to make use of just technical analysis to predict what way the market is going, I personally make use of events to predict the market and it has been working for me most of the time, especially when I hear about events that is really going to cause a big change in the coin, I think you need to mix both fundamental and technical analysis in other to be able to accurately predict the direction of the crypto market.
Technical analysis is most useful where the trader is strictly dealing on hourly trade where one does not have the chance to listen to news to decide ones trade, but when it comes to other types of trades, Fundamental analysis is the major tool that should be activated to make prediction and know the direction the trade will turn to.
Let me just say that both are very important tool to trade, most people that rely on technical analysis alone are already fundamentals themselves, because they already know everything that is happening or will happen without having to read much about this, so technical becomes a useful tool to them.