Did you create the GIF animation using Photoshop?
- In Photoshop you can easily delete the animation frames, from the Timeline panel (Window > Timeline).
- Select the frame to delete, and then click the trash can icon in the Timeline panel.
You can also adjust the timing for each frame using the Timing panel.
Please post the name of the program you use so a Moderator may move this message
-A program would be Photoshop or Premiere Pro or ???
I'm using Photoshop CC 2017.
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You are showing a video in the time line. Click on the three squares in the bottom left corner to convert to a Frame Animation. You can then delete individual frames. Or you might be able to reduce the image size if you intend exporting as a GIF. That should easily get the file size below 3Mb. GIFs are rarely more than 1000 pixels on the long side, but an HD video will be 1920 x 1080 pixels.