Re: publishing, sure you can self publish. But your job at that point is no longer as a writer. Your job is now marketing. The potential for people to see your work is directly related to your ability to sell it and arguably not at all related to your capacity to create it. It's not that good work isn't self published, its that there's nothing to make it stand out from the literary equivalent of drop shipping. The audience can't find it if it isn't being promoted. You're not just competing with every other self published work - from AI generated texts to the branded writing mills of 'authors' who pay drones to push out texts at scale under their name. You're also competing with the entire industry of online entertainment. Every brilliant thing made throughout history available instantly for streaming, purchase or pirating, and sold with every penny big content has to promote it.
As for my own work, I have a small group of friends that I write with in person, and I perform in person occasionally (most recently in the fantastic writers cafe Laidak in Neukoln in Berlin). I'm utterly terrible at marketing, and my work doesn't fit the demographic criteria for contemporary publishing, so you can't find much it anywhere online or off. That's likely true of a whole generation of writers who aren't creating didactic autobiographical morality tales. I don't want to dump stories or books that take months to write into the void of self publishing, but I'm a writer so I still write.
In terms of music - I just spent a few days in Berlin listening to live work at venues like Trixxter. If you're open to experimental live performance there are a whole bunch of scenes in small live venues. Again, not sure how you'd pick it out from the both the dross and the heavily promoted work online.
In terms of film, again my reference is Berlin - there's a whole scene right now that you might call antifilm (I have no idea if it has a formal name). Small films shot verite from life, without a budget, and wilfully rejecting any kind of formal aesthetics (think Dogma on steroids). Wilfully horribly shot on bad cameras, but often incredibly interesting in terms of their engagement with life as its lived now, hauntology, post internet art etc. In terms of specific filmmakers Jean-Michel Brawands work is interesting. There's a whole community around Sputnik Kino and similar small events.