You should be in missionary work.

你该参加传教工作。

《柯林斯英汉双解大词典》

As missionary work done by western missionaries in China, modern newspapers were come out.

随着西方传教士在中国的传教，近代报纸也应运而生。

youdao

They look at this as a form of missionary work to promote shariah and Islam.

CENTERFORSECURITYPOLICY: Center For Security Policy

Convinced by the stranger, Laoghaire agreed to let Patrick continue his missionary work.

BBC: Who was the real St Patrick?

After the Japanese invasion in 1937, Liddell carried on his missionary work even when it became dangerous to do so.

BBC: Chariots of Fire's Eric Liddell is Chinese 'hero'