We should respect others because respecting others not only makes others happy but also helps us to improve.
By respecting others, we can learn how to have= build  a good relationships with others.
Also, we can grow= develop a habit of caring for others.
These are the reasons why we should respect other people.

Evaluation: Your ideas are clear and you gave good reasons for respecting others, which is great. To improve, focus on grammar and more natural word choices like “develop a habit” and “build good relationships.” However, your writing shows good understanding and strong effort.