I don't know if I even have an account anymore, its been like 15 years since I last logged in...

Me too. I tried loggin in, and after a forced password reset I am back, though back to 2018 it turns out.

On Spotify I made a playlist with over 4,000 songs from Last FM. I remember doing it but I couldn't say how I did it now. And also a "loved" playlist which I am revisiting now. First track Whitest Boy Alive: Golden Cage, a stonker.