I wanted to draw a comic about my cat, but then I realized everyone draws comics about their cats. Even my cat is sick of comics about cats. But worrying about what someone else has already done may stunt the great idea that you have dwelling within you.
So instead of completely chucking the idea that you found out someone else has done already, find a way to make it your own! Adapt it with a view or perspective that no one else has done before!
And don’t forget your cat’s daily lasagna ;)
Have a great day!