Meghan, Duchess of Sussex, had a very un-royal 2023, but with her potential memoirs making headlines, can the former actress revive her popularity this year? “What is her brand, and will that brand still be there? The longer she’s out of the public eye, the harder it will be to kickstart it,” royal commentator Richard Kay dished to “Palace Confidential.” “I think we can be sure that one thing she is really doing is being a mum and spending time with her children, but it is interesting. Is it because she wanted to give a bit more space to Harry, who had so much to get off his chest this year wi…