There are some systemd-less distributions like devuan, or what I would personally recommend, Void Linux[0].
Void has been my daily driver for over a year now, and it's been lots of fun, while also being rather stable.
Be aware that it is a rolling release distro, much like Arch Linux and it comes with its drawbacks as well. It uses runit as its init system, which is easily configured via shell scripts, and certainly won't change in the near future, because it's feature complete.
Void comes with it's own package manager, "xbps" (X binary package system), which is used a lot like pacman on Arch Linux. You can even freeze packages if you don't want to upgrade them.
All in all, I'd recommend it, but be sure to play around with it for a bit before settling on it. (Oh, and the installer is a lot easier thatn Arch's too, and there are live CDs with desktop environments pre-installed if that's your thing)