A young and lonely businessman wants to find true happiness in order to give his life more purpose and standing in his way is only himself.

You need to give the lead character an interesting tangible goal.
The lead character needs to do something, and that something will be the hook of your story.

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"Looking for love, a desperate businessman joins a support group for loved ones of cancer victims, but when he falls in love he must keep secret the fact his daughter never had cancer and is still alive."
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As the others have said. ?

Film is a visual medium and the logline needs to be written with visual elements: people, props, places, action.

What's the visual for "true happiness"? ?The visual for "more purpose"? ?The visual for "standing in his way is only himself"?

Write the logline as if it were a silent film where every aspect of the story has to be conveyed by a visual image -- no sound, ?no title cards.

As the others have said. ?

Film is a visual medium and the logline needs to be written with visual elements: people, props, places, action.

What's the visual for "true happiness"? ?The visual for "more purpose"? ?The visual for "standing in his way is only himself"?

Write the logline as if it were a silent film where every aspect of the story has to be conveyed by a visual image -- no sound, ?no title cards.