You can combine "through" and "over" to describe a process or duration along with a change or effect that occurs over time.

You can combine "through" and "over" to describe a process or duration along with a change or effect that occurs over time:

Olivia gained expertise in her field through consistent effort over several years.

In the example above, "through" indicates the method or means (consistent effort) and "over" specifies the duration or time frame (several years) during which this effort was applied, and the expertise was developed.

More examples:

The forest recovered its lush greenery through natural regeneration over a decade.

James learned Spanish through self-study, improving gradually over the course of a year.

What's the difference between "through" and "over"?

You can use "through" and "over" in a wide range of contexts, including:

• Narrative Progression:

  The novel unfolds through a series of flashbacks over the protagonist's lifetime.

• Physical Journey:

  My husband and I traveled through multiple countries over the course of their three-month journey.

• Emotional Development:

  David worked through his challenges over the years, becoming more resilient.

• Professional Growth:

  Through continuous learning and adapting over her career, she became a leading expert in her field.

• Change in Perspective:

  Her views on life changed significantly through various experiences over her twenties.