You've already attuned several mirrors without incident. I do believe it's time you try your hand at repairing them instead.
It's quite easy once you've found the fragments, but there are a few things of note to keep in mind.
Repaired mirrors are fragile and unpredictable. They often break with a single use, and it's never a guarantee that using one will translocate you somewhere safe.
Here's a few shards to get you started.
Restore the mirror to working order and see where it leads.