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The phrase "was sure" is correct and usable in written English.
It is typically used to express a strong belief or certainty about something in the past. Example: I was sure that I had left my keys on the kitchen counter before leaving the house. However, when I returned, they were nowhere to be found.
Exact(57)
He was sure.
Curiously, nobody was sure.
"I was sure".
She was sure.
No one was sure.
Again, I was sure.
One thing was sure.
But suddenly he was sure.
And, actually, he was sure.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com