Creating animated display ads with images

Hello Community,

I'm trying to create animated display ads with images for Google. With the new guidelines from Google and I'm having a hard time getting the animation file to be underneath the 150KB mark. Does anyone know any tricks or best practice tips I can take in creating animated display ads with images for google? I've tried decreasing the resolutions and sizes for the images I include but, when I'm exporting the animation in Animate, the number of colors I used increases the file size. 

• 150kb or smaller
• Animation length must be 30 seconds or shorter
• Animations can be looped, but the animations must stop after 30 seconds
• Animated GIF ads must be slower than 5 FPS

Please help. Thanks.