We can't waste our salvation away.. because it is owned by Jesus
Repent at salvation.. then repentance after is to get closer to God.. not to gain entry to heaven.
(1Peter 1:3-5) Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead, To an inheritance incorruptible, and undefiled, and that fadeth not away, reserved in heaven for you,
Who are kept by the power of God through faith unto salvation ready to be revealed in the last time.
Our place in heaven.. is
reserved in advance at salvation
kept by the power of God.. by His faith
incorruptible and undefiled
by Jesus' abundant mercy
So repentance happens when we ask for salvation.. that is saving faith.. then after this we choose to follow Jesus out of what He has done for us.. this doesn't determine entrance to heaven.. but our closeness to Jesus and any rewards we may have in heaven