Running your own relay is the only way I can think of. But even then, 'immortal' isn't an appropriate term.

I think the only certain fix is to accept that your art will likely die like everything else. It could be the case that the laws of this universe ultimately won't allow anything in it to ever become immortal.

I understand wanting your art to be preserved for as long as possible though. It's probably the same reason humans invented religion, heaven, the soul concept, etc. We put so much of ourselves into our work.