Technical Analysis helps to judge the sentiments and movements of the market. It is an indicator of the next steps, it helps us to make cautious/informed judgments. The same happens in crypto too.

However, the Crypto market is still not matured enough and is very small compared to traditional markets like stocks and forex. Movements here can be manipulated, FUD can be created easily, etc. So Fundamentals play an important role. Movements of BTC also needs to be taken care when we trading.

Hope this helps!