The only thing I can't understand is how the hell it is possible not to get bored with one single fetish in 2 years? Is it some kind of autism or something? Or you actually got bored with that after all and it is no longer giving you any satisfaction?

I don't see any reason to quit it, especially if you do not have any replacement, but you could try to expand range of your interest and add some meaning to all that stuff. maybe instead of just fapping you could try creating your own content like writing stories or making pictures?
I don'd see any benefit from quitting.