For now, my preparations is to donate pretty much most of my belongs to the people I've loved and trusted the most. I would leave them to my siblings but to be honest, I do not know if they have much interest in the same things that I had, so I want to donate to some very close friends.
Along with that, if I have enough funds when I CTB, I might donate half of it to a charity of my choice. and the other half to my family, and maybe leave a small portion to those close friends if they need travel expenses.
I also plan to make a whole document on who I was, and my experiences, my former goals for the future, the interests I had, the things I loved and disliked, sort of like an autobiography and personality description of sorts. I at least hope that that would inspire some people to take up any of the goals or interests I had or give them inspiration on what they can create, I just believe I myself don't deserve to have that joy, but still at least want at least a portion of myself to be survived someway.
I want to leave my password for my password manager to my siblings, so that they may access any account that I used to make purchases or contains any inportant files.
Maybe write some letters appreciating those that have helped me feel joy and to comfort them about my decision, letting them know to not blame anyone but me, I was responsible for what lead to this.
Oh most importantly, this would probably all be done postmortem, as I would most likely leave behind an automated message behind.