你可以用以下句子用英文表达自己的开学心愿：

1. My back-to-school wish is to make new friends and build meaningful relationships.

2. My hope for the new school year is to challenge myself academically and achieve excellent grades.

3. I aspire to participate in various extracurricular activities and explore my interests outside of the classroom.

4. My goal for the upcoming school year is to improve my time management skills and become more organized.

5. I am excited to learn new subjects and expand my knowledge base during this school year.

6. My wish for the new semester is to develop good study habits and become a more disciplined student.

7. I hope to have a positive and inclusive classroom environment where everyone is respected and valued.

8. My desire for this school year is to overcome any obstacles I may face and grow both personally and academically.

9. I am eager to embrace new challenges, step out of my comfort zone, and discover my true potential.

10. My ultimate wish for this academic year is to make it a memorable and successful experience for myself and my fellow classmates.