The next step is to filter the solution until it is completely transparent. When it is free of all sediment and particulate then add SMB as per the Precipitating Gold with SMB video.
You can find a description for the general use of SMB in the Guided Tour Link in my signature line.
The link will take you to four other links, study those four links and then ask any questions you still have. The General Reactions List mentions SMB usage.