...you could also do an ultrasound/mri of the liver...
Your results are excellent.
DNA bellow 2000 is good DNA value..when it gets above 2000, and especially above 20.000 then you need to "worry".
Your ALT is also excellent. Alt bellow 40 for males is good (best to have it bellow 30), bellow 30 for females is good (best to have it bellow 19) .
The only other thing you need to do is Fibroscan, have you done it?
Doctors use combination of DNA, ALT, and Fibroscan/Fibrotest to determine whether or not you need treatment. As your DNA and ALT are excellent currently...the doctor has told you to come back in 3-6 months for follow up.