I tried to keep a (phisical) journal, but I always found myself self-censoring because I feared someone might find it. If I kept my journal in the cloud, I'd be afraid the company where I keep it might have a data-breach or employees with questionable ethics.
Right now I am a uninteresting nobody, but on the other hand I'm just 17. Who knows, mabe I will become a famous politican/enterpreneur/activist/whatever one day and some people will have an interest in my journal.?
I think I'll set make myself an encrypted partition on my laptop where I only install a very basic, gui-less OpenBSD and emacs, for the only purpose of keeping a journal.