It may be argued that focusing on one strategy at a time provides focus and enables one to better master that strategy. However, as Maslow said, "If you only have a hammer, you tend to see every problem as a nail." In this case, you're focusing on retracements. This is fine as far as it goes, but it can often focus the attention in the wrong directions, and one can "find" retracements that really aren't there. And if this leads to failed trades, one can get discouraged.
There is also something to be said for learning all the strategies simultaneously. Depending on the individual, this can be either confusing or liberating. Since so many of the trading sessions you've posted are range-bound and thus inappropriate for retracement trading (since the ranges are so narrow), perhaps you should widen your focus.
There are three basic strategies: retracements, reversals, and breakouts. Retracements are best employed in trending markets or in range-bound markets in which the range is so wide that the distance from top to bottom and vice-versa constitutes its own trend (such as gold from Oct '11 to March '13. Reversals are employed in range-bound markets, particularly those where the range is so narrow that the only way to make any money is by selling the top and buying the bottom without waiting for a retracement (which may not occur until one is already near the opposite side of the range). Breakouts, of course, refer to the eventual breakout from the range, at which point one either trades the breakout itself or trades the retracement afterward, the latter usually leading to a trending movement of some length.
Your "trade of the day" is a reversal, and if you regard this as a missed opportunity, particularly one that you recognized but could not classify as a retracement, then perhaps you should try to employ all three of these strategies depending on what sort of trading session presents itself to you. The tactics regarding reversals are not very different. When either the demand line or supply line is broken after hitting support or resistance, just enter the opposite side. Here you've hit resistance for the third time and the demand line is broken. Therefore, you are free to short wherever you like. If you need to see a little pullback of some sort, note that you have one: the bar with the red circle pulls back from the low to close almost halfway up the bar. From your practice with a tick chart, you will know that on a smaller interval this would show up as a literal retracement in the downmove. In other words, even though there is no technical retracement as illustrated with this interval, you know there is one, and if you were to plot a smaller interval alongside, such as a 15s, there it would be.
