How can a long-time GP partner successfully transition to a Dynamics 365 Business Central practice?

Many Dynamics GP partners have a long history with the product. They have a loyal client base. Their team members have very specific product knowledge and are adept with the necessary tools to help their clients. Now with Dynamics GP late in its product lifecycle and a movement to cloud-based applications how can partners navigate their way to a successful practice with modern solutions such as Business Central?