Thank you for being so mindful ☺️
You should be able to post images from imgur by right-clicking and copying the direct link to the image file itself, which usually ends jpg or png!
That said, don't worry too much. I try to be mindful myself when the image is heavy - my camera outputs jpgs of like 25 MB, so I resize them before posting them, or use imgur.
I appreciate it if someone uses an external method to share their images, but I don't expect that, and I don't mind if they don't. My hope is to soon move the instance to different hardware with significantly more memory, and then it will take a lot of effort to fill it up 😁