Is it possible to repent of sin and not be converted or saved from death in Hell?

Yes…you can repent a thousand times daily but until you have humbled yourself and trusted fully with a sincere heart that Jesus Christ is your Lord who died for you to pay your sin-debt, a debt you could never pay yourself, you will remain in your sin and in repeated failure because it’s NOT until such time you have entered into covenant relationship with the Father by faith in the Son, Jesus Christ, and received the indwelling Holy Spirit as your Guarantor of that relationship that you will receive the anointing-strength-power of the Holy Spirit through the process of sanctification making you a new creation in Jesus and providing you power and strength to battle the sin-nature with victory by covenant promise (John 3; Ephesians 1:13-14; 2 Corinthians 5:17; Galatians 5:16; Hebrews 8:12).