Enjoy your good memories, but let go of things from the past which bother you. Don't try to live in the past. It's time to look forward. Thank God for the blessings of the past. Trust God for new blessings ahead.
Let go of the hurts and failures of the past. Forgive those who have hurt you. Pray for those who have spoken against you. Let it all go. It will only stop you from moving forward. Don't hold on to those things. Give them up to God in prayer. Ask Him to heal any broken places of your heart. He still heals the broken heart. It's time to look forward with your life.
There are two kinds of people in this life. There are those who only look back to the failures and bad experiences of the past. Then, there are those who seldom take time to look back. They have goals ahead, with hope for all the good things that God has for them.
Look forward to God's plans for you to serve Him, focused upon Christ. It's time to move ahead. "Forgetting those things which are behind and reaching forward to those things which are ahead, I press toward the goal for the prize of the upward call of God in Christ Jesus" (Philippians 3:13-14).