Your main character is returning home after being a hero abroad.
Maybe they are getting back from a war, maybe they are the only soldier from their home town that survived the war.
Perhaps your main character is a sailor returning after a long voyage. Maybe they are just getting back from a vacation. Maybe they are returning after an unusually harsh winter wiped out the roads and kept them away for a few extra months.
What are they coming home to? Is it business as usual back at home, does it take time for your MC to get used to being home? Did your MC make enemies while they were away–enemies that are coming for them now?
As always, this prompt is totally free to use!