My SGPT Had Increase From 103 To 159 Just Pass

My SGPT had increase from 103 to 159 just pass over 1.5 month, however, I had not stay overnight for work nor eating unhealthy also do exercise twice a week. Wonder when this number goes up, what does it mean? Is it also the reason that I feel so tired everyday? What else I cn do to make is back normal? And also is this a bad sign?