What you have said above is the exact problem with my method, in becoming greedy can end up back at square one very quickly. The main way in which i try to avoid this is by moving the stop loss as I go into profit, effectively a trailing stop limiting the loss, assuming the trade goes the way I predict.
Its a never-ending problem, possibly with no right answer. My aspiration is to use TA in the most objective way possible, so that I can see both my initial stop and target levels on entry. Now, if TA suggests I can use the current signal whatever that may be to look for a 100pt gain, whereas a 50pt loss would indicate the market is firmly not going in my direction I would be very happy. I have good TA for entry, stop and target, with a 2:1 reward:risk ratio.
However, suppose I take the entry, my position goes into profit but my target is not yet hit: price races up 90pts, and then flatlines. I am looking for another 10pts here, but if I had never entered in the first place, I would never be tempted to enter at this level for even a 10pt gain - there is no TA to support it. So why would anyone else? We all already know that price was most likely to get to +100, but not +110. And if new players don't enter here at +90, why would price continue upwards?
On the other hand, having made 90pts, I might now introduce my trailing stop strategy, and the amount I would set this by is, of course, 50pts. After all, if I could stand to lose 50pts from zero, I can certainly stand to lose 50pts from a +90 position. But here again, the level of the 50pt trailing stop loss has no rational TA: its not support, price could drop straight through it but even if it did, this would not confirm that my original TA was wrong. Price could also just as easily drop 51pts, take me out, then resume and hit my +100pt target.
My strategy these days is to set the target and take it as soon as hit and get all out of the position. Even if price goes to 90% or 80% of target, I take it and get out. If you're in cash, you can re-enter on new TA in the same direction, or take the contrary direction.
I know the books say run your winners and move your stop to break-even and trail your stops as you ride the price and all that, I know, I know, I know. But I'm not writing a book, I'm doing it.