Free GIF Compressor: Compress & Optimize GIFs Online

This online GIF compressor allows you to upload any GIF and compress it into a smaller file that's easier to edit, upload, and send with others online.

Optimize animated GIF

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Free GIF Compressor: Compress & Optimize GIFs Online

Compress GIF Without Losing Quality Online

Gif Optimizer - Compress Gif Online

Compress GIF – Reduce GIF Size on PC/Mac, iPhone, Android

Not sure why it isn't working for you, but right now the limit for GIFs on Medium is 5 MB., by Matej 'Retro' Jan

Quick and Easy Solutions: Compress GIF to Smaller File Size

Compress GIF: Reduce & Optimize Image File Size Online! (Free)