Import the item master, the customers and vendors, the stock on your shelves and the balances you are carrying forward. The ledger opens with the business as it actually is.
The reason migrations stall. Re-keying a master list is where most switches die. These are the four imports that get you past it.
Download the template for the kind you are importing, fill it from your existing system, and bring it in.
Four templates, filled from what you already run, and the ledger opens with your real position.