Enhance should generally be avoided because it can have several meanings (improve, increase or intensify) and therefore can lead to ambiguity:
The plan was reviewed and improved to meet stakeholder expectations.
not
The plan was reviewed and enhanced to meet stakeholder expectations.
not
The plan was reviewed and enhanced to meet stakeholder expectations.
The program increases Australia’s capability to detect emerging diseases.
not
The program enhances Australia’s capability to detect emerging diseases.
not
The program enhances Australia’s capability to detect emerging diseases.