A lot of my epi's are wrinkly. I did a search on google and some say too much water and others not enough.
Epi's are wrinkly
I'm no expert, but if any of mine go like this, I water and feed. I find that severe weather can cause this also if they are outside. .
Having hundreds, I have some that are have to be kept outside so have had this happen over the years
I have had several look even worse after being left at the back of my shelves and not receiving much water or light.
I would repot in fresh mix , water well and feed lightly.
Put in warm area with plenty of light. ( not direct sun )
hope this helps