John 6:29 NKJV
Jesus answered and said to them, “This is the work of God, that you believe in Him whom He sent.”
We don't work for God. Doing what we think will please Him is good, but unnecessary to securing our salvation. That was secure the day we asked Jesus to be our Lord and Savior, the day we believed. His grace is sufficient and we cannot displease Him. We are in Christ fully covered with His blood. We are righteous in Christ and available for whatever He calls us to do.