Dear Mai,
a. It's a big change for me, and I'm both nervous and excited about starting this new chapter.
b. I wanted to share some exciting news about my career with you.
c. After months of searching, I finally got a new job as a project manager!
d. The position is with MCB Company, and it's a great opportunity to work on projects that really interest me.
e. I'd love to catch up soon and hear about what's new with you.
Best wishes,
Nam