Hi Cliff has got it right Chord content per measure,
can and should speed up your melody phrasing or slow it depending what you have to contrast with.

It's an idea to modulate into another key, but not for every song.
And also to save a few magic chords for your chorus not used prveiously.

I always work out my chorus from the title or hook and then write the verses to suit my chorus.
If you have not got a great chorus tyhe song is not worth the effort.

Best wishes.

Have been working at E.M.I. Hayes U.K. in many departments starting as Tea Boy and worked through to A and R, New Artist Management,
Co Writing , with Boy Bands, and some solo acts
I have always played in bands,

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