Astral Travel through a Mirror - Experiences?

I have a friend who produces black mirror for me.
I was able to travel until the end of 2017 or beginning of 2018 then I was sealed and was not able anymore to do the mental move to get out.
I have something to do in the “inner rooms” how Kenneth Grant called Utgard/the astral spheres.

Now I wonder if I can achieve OBEs again through a (black) mirror.

Who travels this way?
Any advice?