Tir na n-Og Award

The Tir na n-Og Awards (abbreviated TnaO) are a set of annual children's literary awards in Wales from 1976. They are presented by the Books Council of Wales to the best books published during the preceding calendar year in each of three awards categories, one English-language and two Welsh-language. Their purpose is "[to raise] the standard of children's and young people's books and to encourage the buying and reading of good books." There is no restriction to fiction or prose. Each prize is £1,000. The awards are named for Tír na nÓg, the "Land of the Young", an otherworldly realm in Irish mythology. The English-language award honours one book with an "authentic Welsh background" whose original language is English.

From the Wikipedia article “Tir na n-Og Award”, licensed under CC BY-SA 4.0.

Check the official rules of the Tir na n-Og Award for the current eligibility window, accepted formats, residency or language requirements and any entry fee. For most established prizes the publisher submits on the author's behalf, often with a limit on entries per imprint.

If you are self-published, look for an explicit statement that independently published books are accepted, and budget for entry fees and copies for judges.