How to drive Office 365 adoption
A successful Office 365 rollout involves driving adoption and helping everyone recognize the benefits of working in an innovative way. Microsoft has a four-step strategy that can help you create a successful project and perform the adoption of Office 365. A better solution is to create a four-phase plan, as shown in the following diagram:

Always measure results, adapt and iterate with your organization:

Useful tips, tricks, and resources to drive adoption
You can see my session, How to be productive with Microsoft Office 365, at Microsoft Ignite 2017 regarding adoption at https://myignite.microsoft.com/sessions/55888.
Note
It is advised that you hire a partner with experience of the adoption of Office 365 to best leverage your business and to help you adopt the products based on your needs.