This will definitely sound weird, but...
I uploaded a lot of images and had only one sale.
Than Alamy changed its interface and I realized all my images had poor discoverability.
I was trying to use very relevant, but few keywords to increase my CTR.
Well, I decided to add a lot of keywords to some images so get the status fully discoverable
I didn't spam, they are keywords related to the images, but some a bit generic like picturesque, horizontal, traditional, etc.
And the sales came, is not crazy number, but one or two per month.
Now the crazy part, so far