Were going to take an extreme yet benign measure using light therapy.
Let’s lock him in the cage for seven days or 168 hours.
Regular food and water, cover the cage at night but the bird stays under the light (assuming you’ve installed on by now) for the whole week.
We are resetting your bird’s circadian rhythm.
The inconsistent light cycles here in North America do an enormous amount of harm to our birds hormonally and provide stress points that as humans we see as well with SAD disorder in the winter.
Please let us know if these ideas help.