From my experience day-trading with leverage is really hard and I don't see much value in it. The risk is too high, although with crypto you can have really good gains if you spent your whole day on it.
Watching the 5 minute and 15 minute candles is pointless. 4 Hour, daily and weekly give you a clear insight instead.
This is how investments happen. You can't buy the absolute bottom or short the absolute top unless you put thousands of orders.