For treating depression w/o meds, consult a geriatric psychiatrist for psychotherapy. More are located near university medical centers. B/c they’re a psychiatrist, they could prescribe meds if needed or wanted.
Since you characterize your depression as mild, maybe a course of TMS (trans magnetic stimulation) would be of help. It has a success rate of 79% with no side effects, pain or downtime.
Electrodes are placed on your skull and a magnetic pulse is emitted to areas of the brain implicated in depression. These are determined by a prior MRI.
Also a support group may be of help. Your psychiatrist should be able to help find one.