I have been searching about the preventive intervention for depression and found several interventions but they are mostly for adolescents, I am searching for preventive intervention that are specific for adults.
The preventive interventions for depression work at any age, one of these can be found here (occupy your mind with this content): https://www.amazon.com/True-Meaning-Love-Loving-Kindness-Pre-Columbian-ebook/dp/B07L32D1C3/
(disclaimer: no Dr-patient relationship, or liability to answer the above question)
Get up early and at the same time every day (to keep the amount of REM sleep low; see https://henry.olders.ca/wordpress/?p=192); lifestyle and diet to keep insulin levels low (see https://henry.olders.ca/wordpress/?p=1766); spend time with people whose company you enjoy; regular exercise; increase dietary omega-3 fatty acids and decrease omega-6 ones (see https://henry.olders.ca/wordpress/?p=198).