I want to automate so it automatically logs into a specific .ovpn on startup which i'll name "default" and then I'll rename whatever server I want to default and rename the old default to what it was then reboot so i can switch servers that way if i need to.
Assuming you're using the regular Raspberry Pi OS (aka Raspbian), then you can use systemd to connect at boot. Here's a guide in the Arch wiki. If you're using a systemd-free distro like Devuan, Artix or Void then you'll need to set up a script/service using the applicable init system (runit, openrc, s6 etc).