High Anti-Smooth Muscle titer, but not autoimmune hepatitis?

Hello,
My main symptom is extreme fatigue for going on 10 months. Onset beginning of September 2023 for no apparent cause.
Multiple tests later, still no definite diagnosis.
I had high ANA 1:320 (patterns homogeneous and speckled).
I had high Smooth Muscle Ab Titer 1:640.
I have normal liver enzymes and had a liver biopsy that was also normal.
What else besides autoimmune hepatitis can cause high anti- smooth muscle antibodies?
My 24 hour urine test showed both low catecholamines and metanephrines, so not sure what that indicates.