What is the opposite of a catastrophe?

Bad: "It was a catastrophe."

Good: "It was a "??????????."

I think "miracle" almost works, but has connotations I don't intend. What's a word for something that was an incredible success beyond expectation?

Good: It was a marvel!!! (Also a wonder)

a thing or person that is very surprising or causes a lot of admiration.

(Collins)

A blessing.

A beneficial thing that occurs that engenders a feeling of being a gift, something to be grateful for.

Lit. ‘a gift from God’.

https://www.lexico.com/en/definition/blessing

bonanza

A situation which creates a sudden increase in wealth, good fortune, or profits. ‘As one would expect, most state and local governments responded to this apparent bonanza by increasing spending.’ (Oxford's Lexico)