This is made clear, so the obvious answer would be that some have “done better,” but a Christian is not “bad” if made “good” by Christ.
Perhaps the question needs to be better defined.
“How do you tell what God wants you to do?”
My answer for this would come by means of a funnel. A lot of times we treat God’s purpose for us as a funnel. but an upside down one. We want to know the specifics of purpose before we get the bigger picture. But purpose-wise, we need to treat our purpose like a funnel as it is intended. We have our broad and then we find the details as they trickle down (1 Timothy 2:4).
Regardless, instruction from that point on is the Word of God and led by the Holy Spirit within you (2 Timothy 3:16-17).
“How to be more disciplined as a Christian?”
My understanding of Scripture is that in our dispensation/age, being a Christian is much more to do with what you believe, than what you do. Belief directs the direction of your discipline.
Our faith is not of works (Ephesians 2:8-9), but we are created unto good works (Ephesians 2:10). Discipline’s origin is observance and study of the Word. When truth is accepted thereof, pursue action and grow.