A person's winter 7-day tour of Montenegro by bus + railway + a person's winter

This is my last stop on the Balkan Peninsula, having previously visited Serbia, Bosnia and Herzegovina, and the city of Dubrovnik, I took a bus across the border to Montenegro, which went quite smoothly. Many people ask me why I chose such a niche country as Montenegro? What's fun there? Is there scenery or culture? Honestly, I'm not sure why I chose the Balkan Peninsula, maybe I wanted to see a slightly different local culture and customs. I've been to Western Europe too many times and it's no longer fresh. Many people also ask me why I didn't travel all over the Balkan Peninsula? There are 7 countries in total, and I have a 21-day holiday, which is perfectly manageable. But I prefer deep travel, I don't like to skim over places like completing a task by checking in a country. So my itinerary is 6-7 days in a country, which is enough for me to see the essence. Winter is indeed not very suitable for travel, the daylight is too short, many activities are not open, there are no tourists so there is no shared tour, but I want to say that because it is the off-season, I enjoy the WIP treatment in the scenic area, which is the joy of being completely unoccupied. And accommodation will be cheaper, so there are pros and cons, you decide. Location: Montenegro