By Joseph Wilkes & Mollie Quirk Meghan Markle and Prince Harry have been told the three things they need to do if they want to regain popularity in the UK and the US. A PR expert says the Duke and Duchess of Sussex need a brand overhaul after their popularity in Britain plummeted to an all-time low, as revealed by a recent YouGov survey. A whopping 68 per cent of respondents expressed a negative view of Meghan. In 2020, the Sussexes made headlines when they stepped back from their Royal duties and relocated to Montecito, California. Since their move, they’ve embarked on various projects and fa…