"become special" is a valid phrase in written English and can be used in a range of contexts.
For example, you could say: "I'm working hard to make sure my baking skills become special."
"Places that have it will become special," he said.
We become special by virtue of not being special enough.
You can become special by working really hard for a long time.
Announced first base coach Robby Thompson will become special assistant to the general manager.
You invest in people you feel can go on and become special players.
In '58, he left to become special counsel to Gov. Harriman in Albany.
Rotating tubes projected on the dome-screen seem to become special-effects passageways, dizzyingly whirling the audience on visceral rides through a history of the cosmos.
And so they became special, too.
Ripken's retirement suddenly became special for the Yankees.
General Holm became special assistant for women's programs in President Gerald R. Ford's administration.
Because Helene spoke perfect french she became special friends of the Valvan sisters.
