There is quite a disparity between the investment account values in Quicken and my broker's account balances. Is it easier to delete the accounts in Quicken and start over?
Can you identify WHY there's the difference? Are all of the securities shown in Q? Are the share/unit amounts correct? Are the quotes correct?
It's probably easier to identify the cause, and correct it than to start over.
Check for Placeholder entries. They are often the cause of large discrepancies between what you see in Quicken vs why you see in your online brokerage account or broker statement. If you find any, they will need to be addressed and closed.
