The usual rate is 2,000 Flybuys Points to 870 Velocity Points.
With a 15% bonus, then that becomes 1,000 Velocity Points.
With a 20% bonus, then that becomes 1,044 Velocity Points.
Virgin is still pending sale to Bain, but the airline is restarting portions of its domestic network. If there are any flights you want to take with them (e.g. within your state or interstate where permitted), and there are reward seats or upgrades available, it wouldn’t be a bad idea to transfer.
But if you don’t have any solid plans, best to leave your points in Flybuys for now. There are bound to be more bonus offers down the track.