Ask yourself, could a murderer get born again after committing murder? If your answer is yes, then you are part the way to comprehending why the Promise of God includes all your sin, past, present, and future. If a man is born again from above before he dies, then to believe there is some sin he could commit after being born again that would cancel his status of born again from above is to assert there is some sin which is stronger than God's Promise. There is no such sin, regardless of how hard satan drives that into your head. Once He 'borns you' ain't nothing nowhere nohow that can snatch you from His Grace AND Power.
The very act of admitting you are a sinner in need of His Grace makes you just what God is searching the whole Earth for, for His Spirit goes to and fro throughout the whole Earth seeking any boy, girl, man or woman who will let God be God IN THEM ... 'For it is God Who is in you, both to will and to do of His good pleasure.' 'You are bought with a price'. and if there some sin that the purchase won't cover --past present or future-- then the purchaser is in default, and God doesn't make mistakes. I am prime evidence of His love and long suffering with His creation.
“Is there some sin you will commit in the future (starting now until you die) that could cancel your having been born again? “
YES!!!!!!!
Hebrews 10:26 For if we sin deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins,
I Cor 9:27 “but I pommel my body and subdue it, lest after preaching to others I myself should be disqualified.”
I Cor 10:12 Therefore let any one who thinks that he stands take heed lest he fall.