You can't without opening a completely new account.
You can however put a custom date filter on your account that starts from the new period.
Click on Custom Analysis.
Enter the date range you are interested in.
Click Analyze
Click the little pin to make it red.
Click custom analysis again to close down this section.
Probably worth putting a comment on your system to advise people why there is a custom analysis there as well.
Good luck with your new start!
11:15, restate my assumptions: 1. Mathematics is the language of nature. 2. Everything around us can be represented and understood through numbers. 3. If you graph these numbers, patterns emerge. Therefore: There are patterns everywhere in nature.