Yeah, use photoshop. XD LOL!
Making GIMP gifs is actually very similar to photoshop. Or like making a flip book. Each layer is a frame. It's a pain in the ass.
Look up lots of tutorials, and realize that it's probably not the best tool for the job. I just use it because I have it installed, and it's open source.
I was just going to say this is so relatable but wanted to know why you used gimp since I would assume you have photoshop installed. But hey use what is at hand and always good to try and stay off the corporate bandwagon.