I disagree. Don't need to force yourself to stick to one specific material if you don't like it. All my life I've benefitted from being a horizontal person - ha

I disagree. Don't need to force yourself to stick to one specific material if you don't like it. All my life I've benefitted from being a horizontal person - having always dabbled in everything I found interesting at the time. Yes to get into a job you'll need specific skills and certificates and there you quickly deepen your knowledge as needed on the topic(s) you neer. But once you're in it you'll shine by having many varied skills. Being the one office worker with excel skills, or the one programmer able to tell a nice narrative, or the one c programmer that understands web apps, or... - you'll stand out. So my suggestion would be to let your passion drive you. Pick up any topic that seems interesting right now and throw yourself into it. And then the next the next day.