I’m with a new brokerage. How do I transfer my old account so I can see all of my previous transactions?

Since the transactions you see inHere® are based on the email you provided to the closing/escrow office for each transaction, any transactions that are under your old email address can still be accessed inHere® with that email. If there is a current transaction that should be transferred to your new email, contact the closing/escrow office that is handling your transaction and they can update the email on that transaction for you.