Congratulations! That’s great progress! Yes, every time your AeT increases, adjust your zones accordingly and then work within the new zones.
Have you done the AnT test yet (linked below)? Once your AeT gets close to being within 10% of AnT, you’ll want to shift to doing more zone 1 training and less zone 2, because regardless of how metabolically efficient you are, maintaining a heart rate that’s closer to your max heart rate places more stress on the body.