Consider the cost: If you have to sacrifice something in order to invest in what is most worthwhile, what might that sacrifice look like for you?
Focus on the right things: Jot a list of the things (or people) you need to invest your time in. How long is the list? What might have to "give” in order for you to be able to invest in the "best" things?
Be ready for push back. You might experience resistance from people in your life who don't have good boundaries. Ask God to prepare you to respond with grace.