Camera accessories for $500?

Hi all! I have a Canon 5D Mark IV, a 24-105mm IS L lens, a Canon 50mm f1.8 STM lens, and a 100mm macro L lens. I’ve also got tube extenders, a pretty good carrying case and tripod, and memory cards I’m satisfied with.

Are there any camera accessories I should get with an extra $500? Im practically brand new to photography and have had a lot of fun getting my feet wet. I like photographing people, landscapes, and my dog haha.

I was thinking about getting a gimbal to try out videos? But also thinking about putting the $500 towards another lens. Just not sure what would be best based on what I have and like to do. Any advice would be appreciated!