How to write a complete letter of more than 400 words to my brother?

About how to write a letter of more than 400 words to my brother, the full version is as follows:

Dear brother

First, I want to tell you how lucky I am to have a brother like you. In the process of my growth, you have always been my most solid support and supporter. I often recall the good times we spent together, and these memories make me feel extremely warm and happy.

When I encounter setbacks and difficulties, you are always the first to stand up and help me, give me encouragement and guidance. No matter the problems in study or the troubles in life, they will not hesitate to lend a helping hand. Your wisdom and experience can always give me the direction to solve problems, and your inculcation can always make me understand the truth of life.

Besides your cleverness, your kindness and concern also deeply infected me. Whenever I encounter difficulties or setbacks, you are always the first to comfort me, support me and give me the courage to face difficulties again. Your patience and concern make me feel the power of love and make me stronger.

First of all, I want to thank you for your support and concern. No matter in school or in life, you are always willing to listen to my troubles and give me advice and guidance. Whenever I encounter difficulties and setbacks, you always encourage me to stick to it and believe in my ability. Your support makes me stronger and more confident, and I really appreciate having you by my side.

Secondly, I want to thank you for setting an example for me. You have always been an example to me. I saw you bravely face difficulties and challenges and constantly strive to pursue your goals, which inspired me to become a better person. Your's persistence and hard work made me understand that success requires hard work and time, and I will always learn from you.

Brother, in my eyes, you are a real role model. You have always treated life with a positive attitude, worked hard and pursued your dreams. Your efforts and successful experience inspire me and make me believe that as long as I work hard, I will definitely achieve my goal.

Today, I want to express my gratitude to you. Thank you for your help and support. I am really lucky to have an excellent brother like you. No matter what problems I meet, I know I can count on you, because you are always on my side.

Finally, I hope you will always be healthy and happy. Continue to pursue your dreams and believe that you will achieve even greater success. No matter what the future holds, I will always stand behind you to support you and grow up with you.

Thank you again for your love and concern.

Sincerely love you, xx.