Sharing 3 alternatives to imgur that are easier to load and use:

1. https://postimages.org/

Been using it for yeeeears, I never once hit any sort of limitation with their free accounts! So it's my #1 rec.

2. https://imgbox.com/

Surprised to see someone already mentioned this. Nobody seems to know about it lmao

3. https://imgbb.com/

I occasionally use this one because the uploaded images have short urls.

It's best to make an account on your site of choice so you can keep track of what you upload.