Whether or not you are personally invested in actually doing a formal personal moral inventory, I think we can all agree that self-awareness is a good thing. Here is a Psalm that I believe supports that intention and can serve as a prayer.
Make your ways known to me, Lord; teach me your paths.
Lead me in your truth – teach it to me – because you are the God who saves me.
I put my hope in you all day long.
The Lord is good and does the right thing; he teaches sinners which way they should go.
God guides the weak to justice, teaching them his way.
All the Lord’s paths are loving and faithful for those who keep his covenant and laws.
Please, for the sake of your good name, Lord, forgive my sins, which are many!
Psalm 25:4-5, 8;11