Capacitor in parallel decrease my power factor
Electronic loads, such as voltage converters and electronic equipment that contain rectifiers and voltage converters generally draw current from the AC source that is distorted, not a pure sine wave. That current consists of a sine wave mixed with sine waves that are integral multiples of the source sine wave frequency. Those are harmonic currents. They are similar to phase shifted currents in thatchy reduce the power factor. However they can not be reduced by adding a capacitor in parallel. Unless capacitors are added as part of a tuned circuit that filters the harmonic currents, they would only reduce the power factor.

Adding any other load that has a higher power factor would tend to increase the power factor.