One artist worth listening to if you like Celtic Woman is the fantastic Cécile Corbel. She is a French and Breton singer, harpist (just like Órla) and composer who has released five albums of original music in the past and most famously worked for Japanese animation company Studio Ghibli as a composer for its 2010 film, The Secret World of Arrietty.

She released an album of music from and inspired by the film ahead of its original Japanese release called Kari-gurashi (借りぐらし; Borrowing) which you can have a listen to here: https://youtube.com/playlist?list=OLAK5uy_naDXQmH78frWC_QRziTySNwsN5RJlG3l8

The film itself is also available to watch on HBO Max (US and Canada only) and Netflix (some other countries excluding the US and Canada).

Links:
HBO Max: https://www.hbomax.com/feature/urn:hbo:feature:GXrGPIQzIqSZGXgEAAAAh&ved=2ahUKEwilmNaK_NvxAhXiQhUIHXn4CDIQFnoECAYQAQ&usg=AOvVaw2Ta-IAdEDy_gTnx5g4Wm9N

Netflix (stay wary if you want to watch it here in English, as there are two different dubs in the language depending on your home region, also the link provided may go to the UK site. The dub on Netflix regardless is really good, and Ireland's very own Saoirse Ronan plays Arrietty here): https://www.netflix.com/gb/title/70216227?s=a&trkid=13747225&t=more&vlang=en