Selfhosted
A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Ubuntu has a set of scripts you can run to harden a new server (not advisable on a server that has already been configured for something). You need an Ubuntu Pro subscription to access them but you can get a free trial and then cancel it after you've finished.
More info at https://ubuntu.com/security/cis.
I did this process for a customer recently and it was pretty straightforward and much much more thorough (over 100 configuration changes) than just tweaking SSH and fail2ban.
I expect other commercially-oriented distros offer something similar.
Fwiw you don't need to cancel or trial anything. Everyone can get free Ubuntu pro licensesbfor up to 5 machines