In my opinion TA is useful for the crypto market but we need more steps to make it easy to use. I have tools like CryptoHopper and you can make good profits from it - mostly in side markets.
Be very careful in order to not loose money. I have experienced that is is often useful to look up your strategy in the trading forums. On some days I even made 1-2%. But when the market goes down very fast you should have a good trigger