Liver function is affected by a wide variety of factors.
LFTs are a reasonably accurate, but fairly blunt diagnostic instrument. What I mean by that is the tests are reasonably reliable. However interpreting their results in a meaningful way requires much more than a quick Google. A good doctor will use LFTs as one diagnostic instrument alongside a myriad of other factors including a detailed patient history, presentation factors, and a physical examination. Generally significantly abnormal LFT results should trigger further diagnostic tests, usually an ultrasound of the liver is a good starting point depending on other signs and symptoms.
LFTs can also vary fairly quickly depending on the presentation. For example acute inflammation or trauma can send ALT and sometimes AST / GGT off the charts, but it may not be correlated to a hepatic condition at all.
The liver is a very resilient organ, which allows us to enjoy things like alcohol, but you should take good care of it. Regular AFDs (Alcohol Free Days) are recommended for everyone, alongside limiting the number of units of alcohol consumed in a single drinking episode (*cough*).
As always discuss your results with your doctor, rather than relying on Google for medical advice.