At what point does a shakespeare say (poem)

At what point does a Shakespeare say
I feel it's time I write a play
What subject shall it be today
A tragedy I've done

Lovers twain have been united
Audiences are delighted
No doubt I shall soon be knighted
Royal fame I've won

The Queen has come to every show
And, flattering, she feigns to know
A couplet from a verse, also
A refrain from a rhyme

But the ones I aim to pleaseth
Most of all upon my kneeseth
Are the folk who cough and sneezeth
Through my prose sublime