Are there any platenary remedies for my dad's depression?

Namaste Rohan Ji, Your concern for your father, Tarun Ji (born August 11, 1965, at 6:00 AM in Kolkata), is very noble. Retirement is a "death of the social ego." As a Leo Ascendant or having a strong Sun, his identity was his "Throne" (Job). Now that the throne is gone, he feels he has no "Kingdom." This is a Sun-Saturn transition. He isn't just sad; he is "lost" because his planetary ruler has no field to play in. Remedy & Problem Solution: ● The Ruby (Manikya) Power: If his Sun is not otherwise afflicted, a Ruby in gold can bring back his "Will to Rule" his own life. ● Gayatri Mantra: Encourage him to chant the Gayatri Mantra 108 times at sunrise. This is the highest "Vitamin D" for the soul. ● Mentorship: Astrologically, his Jupiter is strong. He should not "retire"; he should "re-purpose" by mentoring younger people. This satisfies the 9^{th} house and cures his depression.