By Lauren Gordon Prince Harry is reportedly working on releasing a new book, but it won’t be anything like his tell-all Spare. The 39-year-old’s explosive memoir, which was released in January, was announced as the best-selling of 2023 in the UK, according to Amazon. The hugely controversial book documented all aspects of his life, including his fractious relationship with his father, King Charles, and his turbulent sibling rivalry with big brother Prince William. Harry and his wife Meghan Markle have seen their popularity in the US and UK dwindle after they stepped down from senior roles in t…