If you have customization you don’t want to bring forward, you need a “clean start”, have significantly changed the way you do business, our have unsupported ISV’s, A reimplementing might make the most sense. For AX2012 and R2 customers.
A direct upgrade require that you are running Microsoft Dynamics AX 2012 R3.
Explore the roadmap for upgrading or migrating to Dynamics 365. Avantiico representatives will fill you and your team on the newest and greatest while providing insightful tips for your journey.