Based on this product's specifications, here are some alternatives and similar models
Neutral Density Adjustable Fader Filter (ND2–32) K&F for DJI Osmo Action 3/4/5/Pro
Summary description:
Adjustable fader neutral density filter K&F (ND2–32) designed for DJI Osmo Action 3, 4, 5 and Pro models. Provides variable light reduction from ND2 to ND32 for controlling exposure and motion blur in bright conditions. Suited for action and outdoor video, time-lapse and long-exposure shots; mounts to compatible Osmo Action housings or lens threads.