This effect tells us that, compared to completed tasks, people remember unfinished or interrupted tasks more deeply. If this effect is real, we can use unfinished bugs to strengthen memory—for example, bring a task to 99% completion and leave 1% unfinished. Over the following period, the unfinished remainder will keep reminding us subconsciously, echoing in our minds, and it seems we can gain better inspiration during this time—a brilliant turn of phrase, or an unexpected creative idea. This is creating 1% unfinished to make the 99% completed of better quality.
Another approach is to complete something 100% once, then return it to an unfinished 50%. Complete everything fully first, then erase the answers or erase 50%, and do it again. This repeated reminder of incompleteness will also, to some extent, reactivate my memory of the problem-solving process multiple times. This is being unfinished after completion—it leaves a deeper impression than simply finishing.
Conversely, we can also achieve the intention of weakening a memory by reaching a completed state, because not everything is better remembered more deeply—for example, by redefining something as completed to make up for a regret in our hearts. During a romance, people view getting acquainted, getting to know each other, falling in love, getting married, and living daily life together as a single thing called love. In this process, dating without marrying, or a marriage that falls apart not long after, is seen by others as an unfinished version of this one thing called love, and this kind of unfinished regret can cause enormous harm. But in reality, dating, marriage, and lasting forever are three independent things; whether completed or unfinished, their standards are all set by people and are highly subjective. So we can also break one big unfinished matter into many completed ones to relieve psychological pressure.
Using the Zeigarnik effect to divide things into multiple parts and complete them one by one greatly reduces psychological pressure. Feeling that everything must be finished can mean picking up sesame seeds while losing a watermelon, while being too afraid of not finishing can make us hate starting, causing us to lose certain opportunities and destinies. By now we can see that completion can also become a means for us to achieve our goals, but the prerequisite for treating it as a means is that we must fight against our innate desire for completion—conquer it, and we have mastered it.