“Cut out all those exclamation marks. An exclamation mark is like laughing at your own jokes.”
— F. Scott Fitzgerald —
The sign used in writing after an exclamation or interjections, expressing strong emotion or astonishment, or to indicate a command.
An exclamation point is used to express strong emotion.
“No!” he yelled. “Do it now!”
An exclamation point may be used to close questions that are meant to convey extreme emotion.
What on earth are you doing! Stop!
An exclamation point can be inserted within parentheses to emphasize a word within a sentence.
We have some really(!) cool tattoos on sale this week.
Note that there is no space between the last letter of the word so emphasized and the parentheses. This device should be used rarely, if ever, in formal text.
An exclamation point will often accompany mimetically produced sounds.
“All night long, the dogs woof! in my neighbor’s yard.”
“The bear went Grr!, and I went left.”
And, it is never OK to use it more than once. (Notice I used extreme emotion and it didn't require an exclamation mark. I bet you could just sense it, couldn't you?)
So, that said, continue writing.