As someone who works in healthcare and deals with an ER nightly, I can tell you all that depression, suicide, and other mental health issues go way up during the holidays. It is not uncommon to have a lot of suicide and drunks/drug addicts in the ER on Christmas eve. For some people holidays are a reminder of better times, or a family/loved ones death. It’s a “triggering” time for them. In fact, I work all of this Christmas since it falls in the middle of my work rotation, so I will probably be seeing this.
Generally cities and towns have Christmas events and places for people with no family or lonely people to visit and have a nice Christmas meal. If this is you, look around your local area Fire Station, Town facilities, etc. Ask on local area’s of places like reddit, Facebook, etc.