"devoted to your service" is correct and usable in written English.
You can use it when expressing your commitment or dedication to someone or something. For example: "I am devoted to your service and eagerly awaiting your response".
"My whole life, whether it be long or short, shall be devoted to your service and the service of our great imperial family to which we all belong," she said.
The Queen is carrying on, just as she promised in a famous broadcast on her 21st birthday, in 1947: "My whole life, whether it be long or short, shall be devoted to your service".
I declare before you all that my whole life whether it be long or short shall be devoted to your service and the service of our great imperial family to which we all belong.
It concluded: "I declare before you all that my whole life whether it be long or short shall be devoted to your service... God help me to make good my vow, and God bless all of you who are willing to share in it".
She made this promise on her 21st birthday: "I declare before you all that my whole life, whether it be long or short, shall be devoted to your service and the service of our great imperial family to which we all belong".
My whole life, whether it be long or short, devoted to your service.
Focus on the details of your plan in the section devoted to your product line or services.
He was devoted to public service, the public good.
"He has spent 40 years of his life devoted to public service," Mr. Brill said.
His later years were devoted to government service at the court of Catherine II of Russia.
Hardworking and intelligent, Guizot was devoted to the service of the king and to the defense of the status quo.
