how can i reduce my ALT level?

I had completed my treatment of tuberculosis about one year ago. At that time during taking medication like myrin p fort my ALT level raised to 150 but doctor told me its happen during the medication with high antibiotic. But now my treatment is completed and I am feeling absolutely fine after my treatment has finished. Two days ago I checked my LFT and reports shows my ALT is 60 that is not normal. I went to doctor and he further examine asked for hepatitis b and c but both are negative and abdominal ultrasound is quite fine. And I am worrying because I have been called for medical for student visa for the canada?