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Hello @prosperousday!
Just Use this :

https://steemitimages.com/widthxheight/ + link of the Image

To resize the image just change the widthxheight to 600x600, 500x500 or 400x400

https://steemitimages.com/600x600t/ + link of the Image

https://steemitimages.com/500x500t/ + link of the Image

just like that...