A big vision is not compulsory. Doing what makes sense today is all you need.
How do you decide? you already know it, to make sure you're staying focused on what's honestly important to you, instead of doing what others think you should.
If you do this for yourself, you'll encounter misunderstanding, but who cares? You can't live based on someone else's expectation. You have to just do whatever you love the most, or you'll lose interest very quickly.