In any field of activity we need moderately difficult tasks in order to develop

Too easy work presents no opportunity for growth. Moreover, it makes us feel bored and dissatisfied with life. Look for tasks that require effort exceeding your overall level of responsibility. When you feel that you have completely mastered the situation, continue gradually moving toward the new level. An important remark: don't overdo it. Totally overwhelming goals can cause panic, which will not allow you to concentrate, so you need to maintain a healthy balance. The task should be slightly beyond your existing skills, but it should be doable anyway.