Hi. Welcome To Healthcare Magic
Your elevated ALT(normal 8-20) is very mild. I suggest you repeat the test and confirm.
If still high and around 35, still it is mild elevation. But you can pursue the following tests: Hepatitis
Panel(Rule out Hep B,C,); Ultrasound
upper abdomen to see fatty liver
If the tests are normal and you can repeat the test after 6 months and if still high consult Gastroenterology and get the advanced tests done.
Regards, Dr. Jagdish