Reengineering MFC VC++ Desktop application

A Windows MFC, VC++ based desktop application requires to be reengineered. We need to perform a walkthrough of existing code and recommend a roadmap to reengineer the application. The reengineering in the scope of the current project involves upgradation of the UI from the existing MFC based UI to one of the current Microsoft frameworks like Fluent Design (or any other recommendation that the candidate can propose)