It is a very typical image with charging，with streaks and astigmatism like effect. You can try two methods
1. Find the Zero Point of Charge(ZPC), it is normally in low accelerating voltage. Fine adjustments of the SEM must be available. You need to know roughly in which range the ZPC falls in for your material. Then gradually decrease your bracket of of voltage to find ZPC. It might be time consuming. And may not be good for organic or plastic materials since their ZPC are low.
2. Coating (Carbon, Au, Pd-Au or even Cu). Make sure of the conductivity while maintain the thinest coating.
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