If your server doesn't rely on docker I would give FreeBSD a try. I've been using Debian for 20 years and moved to FreeBSD a few years ago. Now I can never go back. Not that I don't like Debian anymore but FreeBSD is a true server system. Simple, fast and stable. And with their jails implementation (something like docker but less obscure) you can easily isolate your services from the rest of the system.