sudo rm -rf ./ and sudo rm -rf . are, as far as I know, the same command. Did you mean that you dropped the . and ran sudo rm -rf /?

Fortunately for me, this never happened to me, but I have gotten pretty close to running rm -rf ~ after mistakenly creating a directory caller ~…

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Oof sorry my bad lol

I remember this site

https://www.linuxatemyram.com/

But honestly, although I can’t check it, 1GB idle is still far more ram than what I get idle, so you might have some weird program auto-starting and actually eating your ram.