About downgrade - you can host a static website in s3 directly, without a server at all. Maybe that's an option to explore. You can even use your own domain using a CNAME record.

You can push quite a lot on such machine. I used it as a shell access for my stuff from any place in the world, instant messages, IRC. Classic IM networks died so that part is gone as well, but a VPN like wireguard is a great choice.

A small monitoring system should fit.

A clean install of mariadb or postgress is around 40-60MB of RAM as far as I recall. This should open some doors as well.

A webdav/carddav/caldav server should also fit. I am about to check sabre/dav (sabre.io) software on a similar machine. So you can have a selfhosted calendar or access to your files on the go. Webdav can be handled by a web server directly (natively by nginx or apache etc).

I am recently charmed by Archivebox app, it makes backup of a website using multiple methods. UI is a custom Django Admin interface. It takes below 200 MB on my system.

A Teeworlds game server, if you are nostalgic towards quake but want a simpler experience for a break with friends.

Make sure to checkout the list at GitHub under awesome-selfhosted/awesome-selfhosted. Many, many inspirations there.

Here's a great list that you can look into: https://github.com/awesome-selfhosted/awesome-selfhosted

I use my 0.5gb vps for: - scripts (crawling/cron jobs) - download manager - prototype of hobby projects - SSH tunnel

For static website I suggest cloudflare pages! It's free, fast, and easier!

I remember I was able to run Oracle 6 or 8 once with it

It should be fine if your backend is not doing any memory operations

If you want to host another website, you can do it but just keep it static no backend involve

Backup MX or private mail server (e.g. using Postfix)

Web Server for mostly static content (.html files, etc.) (e.g. using nginx).

IRC client and VPN