Once you do it for long enough it might be worth it to consider configuration management where you declare native structured resources (users, firewall rules, nginx reverse proxies, etc) rather than writing them in shell.

I use Puppet for distribution of users, firewall rules, SSH hardening + whitelisting, nginx config (rev proxy, static server, etc), Let's Encrypt certs management + renewal + distribution, PostgreSQL config, etc.

The profit from this is huge once you have say 20-30 machines instead of 2-3, user lifecycle in the team that needs to be managed, etc. But the time investment is not trivial - for a couple of machines it is not worth it.