The entry is often triggered once the price retraces and closes (the swing high). A more conservative approach is to wait for a close below the low of the breakout candle or the low of the session that marked the initial high. This ensures the pattern is confirmed.
Not every bank stock or index will offer a clean retest. Sometimes, after the first breakout, price never returns. That is fine. Do not force a trade by anticipating a retest. Wait for the market to show you the 2 Top setup.