Try writing it out as a story, that may help, you can do it in a document or in handwriting?
This may assist with visualisation, walk-through on creating wards.
Try to imagine the altars, one at a time. Look at a sheet of white paper. As you imagine the altar, look at the paper, and using a black pen draw cricles, counter-clockwise, onto the paper, as though you were projecting the altar onti the paper in your mind’s eye then drawing over it to close it. Fold the paper into 4 quatyters and then burn it if possible.
If those don’t work, write out the sentence “With this intent I am closing my old altars at (either address, or nickname you gave that location)” and the sigilise it using any of the chaos magick sigil methods.
As you active the sigils, send out the command in your mind for the altars to now close down and become inactive.
These are just some ideas, taken from methods I have used at different times and applied to your situation. 