How to use the last days of this year to prepare for the next one

Most companies aren't working as much as usual, many of your colleagues are out of the office and it seems like there isn't much to do. This is what the end of year is like for many companies. However, this time can be used for constructive work to give you a better start to the new year and improve relationships with your customers. Here are several tips on how to use the end of the year constructively to prepare for the upcoming year.