Here are some possible English abbreviations for "自信勇敢坚强快乐":
1. CCBH (Confident, Courageous, Brave, Happy)
3. SBCJ (Strong, Brave, Confident, Joyful)
4. HCBP (Happy, Confident, Bold, Powerful)
6. SBHJ (Self-assured, Brave, Happy, Joyous)
7. FCHR (Fearless, Courageous, Happy, Resilient)
8. BCHJ (Bold, Confident, Happy, Joyful)