I presume, you want to remain in the field of digital marketing & check what’s the add-on if you learn data analysis! Though these 2 are different fields but whether you will benefit from learning data analysis, it will depend on your current KRA & Designation.
Take one of numerous possible examples:- using Sentiment Analysis on Twitter via R, you can check what are the feelings for a particular political party being aired by the public, mood after a cricket match is lost, whom does the crowd feel responsible for the loss, does a political leader elicit positive vibes or negative vibes or positive vibes etc.
Thereafter, you can use Digital marketing to cash-in on the result.