rasensprenger

I understand that perspective, but does it really have to be advertising?

You're good at it

Boot from a live disc/usb, check the kernel logs. That should at least tell you where the boot process got stuck, what to do about it depends on what exactly broke.

The site looks good, but it desparately needs content moderation

I don't know much about systemd, but i assume the file should be owned by root? It looks like it isn't, so try chown root:root spotifyd.service

I'm not sure spotifyd is just spotify (Edit: I checked, its some kind of spotify client meant to be run as a daemon? No idea what permissions that needs)

And the user that executes a service isn't determined by who owns the service file, there is a user option in the service config