As of now, I haven't heard anything definite regarding a new Discworld novel. Terry Pratchett was the mastermind behind this amazing series, and without him, it's hard to say if there will be more. However, his estate might collaborate with other authors in the future to continue the legacy, but there's no official word yet.
As far as we know, there isn't a new Discworld novel available. Terry Pratchett passed away, and so far, no new works in the series have been published. So, you can't find it anywhere for now.
The last Discworld novel is 'The Shepherd's Crown'. It was published posthumously as Sir Terry Pratchett passed away in 2015. This novel continues the rich tapestry of the Discworld series, with all its unique characters, satirical humor, and imaginative world - building.
I would recommend 'Guards! Guards!'. It's a great starting point as it introduces the city of Ankh - Morpork and the Night Watch in a really engaging way. There's a lot of humor, a good mystery with the dragon plot, and it gives you a feel for Pratchett's unique writing style.
'Equal Rites' can be a good starting point as well. It deals with the idea of female magic in the Discworld, which is a unique concept. The story follows Eskarina Smith, a young girl with magical potential. It has Pratchett's trademark humor and a story that will draw you in. It also gives you an introduction to the magic system in the Discworld, which is quite fascinating.
I would recommend 'Guards! Guards!'. It has a great story with the Night Watch in Ankh - Morpork. The characters are really engaging, especially Sam Vimes. It's a good introduction to the world - building of Discworld, with its unique city full of all kinds of strange creatures and characters.