Fasting is to go without food — usually — for a prolonged period of time. It’s a way to devote yourself to God for a time of prayer. There may be an intensifying of prayer.
Maybe it would be good to fast your past. Let go of the failures and don’t believe you have to continue in them. Fast your successes; don’t rest on your laurels. Don’t hang on to your hurts. Let it go.
God is definitely about moving forward. Many people are crippled by the past. They’ve lost their vibrancy, their joy, their zest for life. Don’t be one of them.