There seems to be only one bus in the evening from Sevilla to Caceres during the winter (via Alsas). When does the more frequent service start?
What makes you think there will be an increase in services, beyond the seven a day at present, which as far as I am aware has been the case for years.
Jan p.m.ed to say - 'The Alsa website shows only one bus from Sevilla to Caceres at 6:00 p.m. in December. If you click on "no date" there are more throughout the day, but they seem limited to other times of year. Are you saying that there are multiple buses all day all year long?' I replied - 'You did not provide any date but 'winter' in your post. A search on a random date (1st November) gave me the same seven journeys I was expecting to see from previous experience and earlier this year.
You are going to have to address your query to ALSA, but I would not be surprised in these times they are reducing services, which I think I noticed with a journey elsewhere in the country. However, I would be surprised if from seven to one a day. Good luck.'