Like it has been mentioned, less light.
One trick that is done in the industry I represent is putting a filter over your lens.
ND3, ND6, ND9 = Neutral Density filters are a great way to reduce your light from out of the camera. However, I do not know if your camera has the capabilites to put filters on your camera. The higher the number, the 'thicker' the density. If you can get filters, and you do choose to go this direction, only buy the ND3 and the ND6 because both together creates ND9.
Another trick is to keep your long exposure,like you have been doing, keep something black in front of, and close to the lens, (cloth, art board).
Keep the black cloth in front for say 9 seconds out of 13 (experiment time) and then remove the cloth to let the camera get an exposure.
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