You can use https://ezgif.com/ to optimize your gif, also you should reduce the framerate to the bare minimum. Your framerate seems WAY too high, 20 or even less should be enough. It looks like 60? The maximum i would ever go for is around 24fps, more than that is unnecessary.
The most efective way, after reducing the framerate, you could reduce the amount of colour you use. Maybe move to a smaller colourspace and remove some deph.