Digital Marketing? Okay... If you can only listen to one advice on this thread, do make it this one.
Stop whatever you're doing and clear your schedule for the next 3 days.
Once done, set up your laptop and turn on YouTube.
Now search up these names:
Gary Vaynerchuk
Niel Patel
Sean Ellis
Watch their videos and read some articles authored by these dudes. Do that for 3 days and take notes.
That's a good start. After that, it's all about execution. Go for it!