I'm on the point of the story where I am travelling to Aryth's Tower and to navigate my way to the boss. Though I seem to be stuck...

Each mirror I go through, I seem to go through the wrong one, and I've been trying to get the correct one for nearly a full week now. Jinxie always says it's not the correct mirror, and I've tried to do the same one twice, three times, or go in a pattern with it (probably not wise though) but I can never guess which is the right one.

If someone can help out, I would love it :)

I had the same issue. I'd recommend writing down every route you take, to eliminate double-tracking. Here's my list:
Astryls Spire Mirrors
-Right - Amethyst
-Left - Emerald
-Left - Silver
-Left - Amethyst
-Right - Sapphire
-Right - Jade
-Left - Emerald
-Right - Bronze
-Right - Garnet
-Right - Ruby
-Right - Emerald
-Left - Amethyst
-Left - Emerald
-Left - Silver
-Left - Amethyst
-Right - Sapphire
-Right - Jade
-Left - Emerald
-Right - Bronze
-Right - Garnet
-Right - Ruby
-Left - Gold
-Right - Sapphire
-Right - Jade
-Left - Emerald
-Left - Silver
-Left - Amethyst
-Right - Sapphire
-Right - Jade
-Left - Emerald
-Right - Bronze
-Right - Garnet
-Right - Ruby
-Left - Gold
-Right - Sapphire
-Right - Jade
-Right - Amethyst
-Right - Sapphire
-Right - Jade
-Left - Emerald
-Right - Bronze
-Right - Garnet
-Right - Ruby
-Left - Gold
-Left - Boss Room

If you hit the gold room, go through the left mirror, and Aryth's through there.
Good luck!

Middle - Garnet
-Right - Ruby
-Left - Gold
-Left - Boss Room