Yes,alcohol consumption may lead to elevated liver enzymes
GGT is specific for alcoholic liver injury.
It is important to know other parameters of liver function test like bilirubin
You may need few more investigations like viral markers and ultrasound
You should also try to control your weight.
If SGPT,GGT are raised then I suggest tablet ursodeoxycholic
acid 300 mg twice daily for three months to my patients.It helps in regeneration of liver cells.
You should also try to avoid alcohol completely.This is must for you.