I have very rarely had any issues with depression, my whole life, and when I was depressed there was always a clear reason (e.g. a breakup). Until about a year

I have very rarely had any issues with depression, my whole life, and when I was depressed there was always a clear reason (e.g. a breakup). Until about a year ago, when I got my first fully remote job, and after 6-8 months I realized I was starting to be depressed a lot, listless, feelings of despair and anxiety, etc. Just doing more of my work in a coffeeshop or elsewhere with people around, seems to make a big difference. Which implies that perhaps just visiting a depressed friend a lot, might make a difference? Just a thought.