I don’t know a lot about the rest of Europe on this, but here in France it’s been more than a decade SMS are unlimited in mobile plans, and these plans are quite cheap.
I have the same issue and it's driving me crazy. One bluetooth device is waking up a MBP M4 regularly during the night, lighting up an external screen. Even without any connected devices.
We also migrated away from Next.js last year to [Vike], big improvment on developer experience all around. Most of our needs are covered by just pre-rendering pages ([SSG])
I really like Dokku. I recently wrote a plugin to automatically expose the apps I add on it on my local network as subdomains of the host via MDNS (https://github.com/calyhre/dokku-mdns), perfect for hobbyists
Never used Fly.io but I have a website running on Render (2.4M unique users per month) and the service is getting quite nice. Occasional hiccups, but they are improving. Not as stable as Heroku used to be 7-8 years ago yet, but it's also waaaaay cheaper.
I really like their Docker support and infra as code, makes it very easy to spin up a whole thing while not being too far conceptually from Kubernetes for example.
Nice product! I might have missed mentions of it, but is it real-time editing? Does it supports multi users?
A warning that might spoil a bit your adventure on the long run: Your published pages will be exploited somehow. SEO backlink abuse, phishing, etc. Offering free public hosting is what people with ill intent are looking for, and you can be sure that at some point they'll look at your solution