I attempted CTB a few months ago after my 30th bday. I've had ideation since I was a kid though. I live by myself and disconnected from friends and family over a year ago.
The month leading up to the attempt, I considered journaling everyday in a word document, that I know would've ultimately been opened when my laptop was discovered. Because my thinking was more complex than I could ever get out in one sitting or one instance of trying to say "this is what I think and feel," I thought logging the depths and nuances of my thinking would be some kind of consolation to others that this wasn't impulsive, but more a 30 year long process coming to a conclusion.
But ultimately I decided against it. For my situation, the last month of being alone and alive, in a way this was my method of breaking up with being alive. I needed and wanted my focus to only be on myself and making sure that I was sure about going through with it.
And also I figured, no matter what I say or don't say in any letters left behind, I can't guarantee any control or influence how others would react or process my death. Staying alive is to risk unforeseen suffering. Staying alive is to risk losing people. The people who would have learned of my death, by being alive they have accepted these risks despite any rosy pictures they may have about life's "beauty" or whatever.
Eh I rambled a little. I guess this isn't really an answer at all because I consider "moving on" and acceptance of things, ultimately that responsibility falls on the individual, no matter the influence or not others may have on that processing. And I just don't have any strong enough feelings for my family to consider expending that energy to be worthwhile.
Sorry, this probably isn't a helpful response at all :(