Control File Sizes

So I've been designing some WebM/Animated GIF Files lately in After Effects. and then I'm Exporting them to Adobe Media Encoder so I eventually upload them to websites withthe use as Short Animations/Notifications (Mainly for alerts on my Twitch Channel).

The issue(s) I'm running into though.

-Media Encoder says the Fill Size won't be too big and then with about 10-30 Seconds. WebM Files just sit there and don't finish their Render because Media Encoder has stopped working

-It doesn't matter the Composition Size because after I'm done rendering the file(s) the source that I'm uploading the files(s) to says "Your Files Are Too Big. The Maximum File Size Is 30.00 MB" I look at the File(s) and they're bigger thant the 30.00 MB like the Upload Source has indicated. But why are they such large files when I've seen in Media Encoder that these Files should be fine because they show they're under that 30.00 MB File Size Limit.

Any ways around these File Size Ajudtments? I've already been that person who's taken a 1920x1080 Comp Scal and went down to 1280x720 and then even smaller to ensure the file size will decrease. And yet theyt're still too big.

The File I've attached is 31,172 KB aas a .gif format. and I see I'm unable to share the WebM Format. But I garentee the file is too large