At the end of each season you need to consider how to prepare for the next one. One option is to use your existing classes and just carry on adding new series and races as before.
If your race programme will be much the same next season as last, you can duplicate your existing series. From the Schedule menu open an existing series in edit mode. Click Copy this series and opt to copy it to the same class 52 weeks later. This will give you a new series with the same races in it on the same days of the week. Do the same for your other series.
If you have lots of boats and want to make changes for the new season, just carrying on adding new series and races for your existing classes may lead to problems. You may need to delete some boats from the Boat Register in order to remove clutter, or remove old races so that the new ones are easier to find. But if you delete boats or races you will also delete their results and you may still want to have last year's results available.
Basically there are two ways to proceed. One is to add new classes and schedule your series and races for the new season using those classes. So you might rename your 'Laser' class as 'Laser 2021' and add a 'Laser 2022' class for new races. You add all the Lasers that are carrying on for the 2022 season to the Laser 2022 class along with any new ones. There is still a problem, though, with any boats that have changed helm. If you change the helm field in the Boat Register the new name will appear for old races as well as new ones. You could get around that by adding a new boat with the same sail number and put the new boat into the 2022 class, but things get messy.
A better way is to archive your existing data and do a spring clean ready for the new season. This is the procedure to follow:
Hint: if you wish to set up a new schedule of races for next year that is similar to this year, the easiest way to do it is to copy the existing series. Go to each series that will be the same next year and copy it to the same class adjusting the start times with a 52 week delay.