If you would like to transfer your SoFi Invest account to another brokerage firm you can do so through ACATS (Automated Customer Account Transfer Service).
You would initiate this transfer request from the brokerage firm that you wish to transfer to. You may need to reference a DTC number for your transfer. SoFi's DTC number is 0158.
Please note that there is a $75 fee to transfer your assets out of SoFi Active Invest accounts, whether as a partial or full transfer.