Ans:
If the recipient is someone you know well, such as your parents, friends, or co-workers, you can close the letter with any of the following phrases: "Kindly," "Warm regards," "Much love," or "Yours truly."
If you're writing a formal thank you note, you can sign off with "Yours faithfully" if you don't know the recipient's name or "Yours honestly" if the recipient's name is included in the salutation.
Then, at the bottom, sign your name.