Tenebris Nox

Could you set up a Cloudflare tunnel and make sure the security rules are tight enough to keep others out?

Have you been listening to and analysing the lyrics of mid-1970s Pink Floyd? If not then that could be your next move.

Check out Memos. It does most of what you want. There’s an app, MoeMemos as well. I’ve used Memos as my journal for a couple of years now. (There’s also a sync with Obsidian if you use that.)