Creating GIFs with low frame rates, small dimensions, and limited color palettes can help reduce the likelihood of a GIF inducing a seizure. See More Information on the WCAG Guideline: 2.3.1 Three Flashes or Below Threshold.
This GIF Has an Increased Risk of Inducing Seizures
In some cases, it may be best to provide an alternative to the GIF altogether. This could include a static image or a video that does not have the same potential to trigger seizures.
If you are the creator of the GIF, it is advised to tone down the color intensity for increased accessibility.