Stay away from anime, at least most of it. Maybe it's just me, but there is a lot of pervy/pedo stuff in there
If you've always been interested in ballet I'm sure it's not a problem. But if for some reason you think you're using ballet as a Psub then maybe you'd better avoid it.
To be honest, I think this is the hardest part of the journey, you never know where to draw the line. I don't struggle with porn anymore, but p-subs like some random stuff on Instagram or from some other supposedly porn-free sites still bother me a lot. I feel it is not as bad as watching porn, but this is still something you need to be wary of, not to take it too far.
I think that's fine. I watch sometimes pictures of girls in bikini/tights/bra, nothing wrong about that.
I think you should avoid them at all costs. Just now I was thinking about that. How easy have the last days been if I compare them to the previous streaks, when I used psubs. Relapse creeps up on you one step at the time, don't let it take any.