This is God speaking, in a psalm about being restored after a mess. So the guidance He promises here is offered to someone who did not have it all figured out.
I will guide you along the best pathway for your life. Notice He does not promise to hand you the whole map tonight. He promises to guide, step by step, which is a relationship, not a printout.
And it is the best pathway, not just a pathway. God is not settling you into a backup plan for your life. He is steering you toward the good He specifically has for you.
So you do not need to see the whole route to take the next step. You need the Guide, and He has promised to advise you and watch over you the whole way. Ask Him for the next step, not the entire map.