Define coding standards: Establish guidelines for records, value objects, pattern matching, async/await, Span<T>/Memory<T>, and API design.
Identify areas for improvement: Review existing code and pinpoint sections that can benefit from modern C# features.
Refactor code: Apply records for immutable data, value objects as readonly record struct, and pattern matching.
Implement async/await: Use async/await for asynchronous operations with proper cancellation support.
Optimize performance: Utilize Span<T> and Memory<T> for zero-allocation code in performance-critical sections.
Design APIs: Accept abstractions and return appropriately specific types in API design.
Test changes: Write unit tests to validate the refactored code and ensure it meets the defined standards.