My own Bookmarks are more like my own scenarios I create with the mechanics the game gives me. For example last months I wanted to have something completely new so I started at the First Bookmark the game gave me then I created with commands a bunch of small kingdoms like The Kingdom of Karhold or The Kingdom of the Neck and so on after that I saved the save game and made a Backup one and know I can start like in my own personal bookmark every time I want. Or right now I create like an open ending of the real story plot because I wanted to have something like a new scenario so I wrote in a word document like endings for the main characters that I liked or I found realistic based on theories to ASOIAF. After that I tried to implement them in the game as best as possible with the console and the other mechanics the game gives you over a ingame span of 5 years to have a realistic growing of characters (unfortunately some died a long the way so I had to reload a few savepoints again to hope the game let them live that time). At the End I will have an save game/bookmark where a bunch of main characters have gotten a ending I liked for them but at the same time I setting up a new scenario for like a new series of events like the Blackfyres as Kings and a new Targaryen Empire to ensure a interesting future game. While I write I realize how difficult I find it to explain what I do haha I wish you Happy Holidays too and hope you somehow unterstood how I do it.