I need to go through a couple of things before we get started.
Once you create a new notebook you may find that sections have been changed into alphabetical order, rather than the logical order. This is most obvious in in the way that the months have been re-ordered under the daily planning section. You can manually drag-and-drop sections into your preferred order this will be retained when you close your notebook and reopen it.
Another thing you should do before you start using the daily planner is to create a new year, rather than just starting to populate the template as is. It is much easier when you start next year if you maintain the blank year template.
Unfortunately there is no easy way to copy an entire section group, so the best plan is to create a new section group for the current year and to copy each month manually. To do this right click on the month section and "save as" to a convenient location. Double-click on the saved .one file which will launch in OneNote under open sections. From here you can drag the whole section into the new year section group.
Okay that should be enough to get you started. The following video demonstrates the steps outlined in this post in case you need a little extra help.