"It's better to hit a home run on a fastball than doubles on a curve. "
There are always multiple ways to get to a certain goal. The question you really need to ask yourself is, "Is what I'm doing the best and fastest way to accomplished my goals?" If the answer is no, you may need to re-evaluate why it is you are not taking the best route.
Are You Moving Horizontally?
Many times a skill you acquire, project you complete, or place you work is a delusion of vertical growth. "You are becoming more versatile" you say to yourself. Are you becoming more versatile or are you just spinning your wheels? People don't want someone who is average at everything. They want someone who is great at one thing. "A jack of all trades is a master of none" is the age old adage. Basically, it means that you are getting the basic concepts of an area of study, but aren't putting in the necessary time and focus into it's mastery. Joel on Software calls this the hockey stick learning curve. Are you learning something and then moving on to the next to "build your toolbox"?
Build Yourself Vertically
If you aspire to fulfill your goals, you need to put your absolute focus into it's completion. Spreading yourself too thin is a recipe for disaster. Diversity is a delusion of stock brokers, business owners, and software programmers. The more keywords they can stuff onto their LinkedIn pages, the better off they think they are. The true fame and fortune comes from focus. Focus on mastery, no matter the task. They say it takes 10,000 hours to become a master at something. That's an average of 5 years working 8 hours per day to become a master. How long will it take for you to master all the tools in your toolbox? If it will take you twenty years or more, it may be time to throw out some of those old tools.
A Fine Scotch is Just That. Scotch.
Don't dilute yourself. Focus on vertical growth and age yourself like a fine scotch. Don't make yourself a long-island ice-tea that everyone thinks they want just because it's packed with a ton of bottom-shelf liquor. People pay more for top-shelf scotch in less quantity than they do for a gallon of bottom shelf watered down mixed drinks.
Where do you want to be? Top shelf or bottom?