Either Soulseek (Which still manages to be my one-stop shop for this kind of thing) or forums, but you’d have to find an active forum related to that niche. For example there’s Squidboard for game and anime soundtracks

Thank you so much! This will be helpful (for both my pirate and official portfolio)

Good to know there’s a way to keep an easy re-uploadable backup in case the site goes down. I hadn’t thought about learning some HTML and CSS, thanks for the tip!