In addition to the person having given their permission, a large number of other data points are collected in your marketing system in Dynamics 365.
You must move from doing marketing to talking and thinking about data marketing. Data-driven marketing has been here for a number of years, but in order to really become data-driven, you must have a plan to convert knowledge from data into actionable activities.
All activities and campaigns must be able to return data to Dynamics 365.
You need to know which data points are to be collected and exactly what you want to use them for? Which insight means that a sales topic should go directly to the sales department, and which should instead be added to an automatic flow that is branched with different emails, so that the individual receives relevant and targeted communication for their specific needs. It creates new data that again has to be translated into insights and actionable activities.
The recommendation would be to start simple and initiate a few initiatives that can quickly provide data insight and try to take action on these.
Every time you plan a new campaign or marketing activity, also discuss the data from the activity.
Just as you have a plan for executing the campaign, images, layout and Call to Action, there must also be a plan for data.
Build an experience and slowly add and expand. Even small steps can quickly yield big gains, and in the longer term the experience and knowledge you build up will be very valuable.