The CD version of Dancing Queen I have is 14 (streaming quality) LUFS and a respectable 11.5 in Dynamic Range.

It peaks at about -0.7 so it is not hot or over compressed by today's standards. It fact in has a pleasant sound. It is not a big monster fat .wav. but not skinny either, about what you would expect from that time period.

14 LUFS and 11.5 to 12 in DR are what you are aiming for today, no matter were you are peaking volume or amplification (headroom) wise. LUFS is not the same as volume, per se. It is something you have to google and study.

https://www.audiodraft.com/blog/audio-levels-101-all-you-need-is-lufs/

But basically, if you keep it below zero dB (start with headroom in your mix) and try and get 14 LUFS and 11-12 dynamic range you will sound good almost anywhere.