Trust in Jesus Christ alone as the one who paid for your sin
CORRECT!! We can do nothing to pay for our sins or earn eternal life. No amount of good deeds, remorse, or promising God better action can provide us eternal life. It has been 100% paid for when Jesus Christ died on the cross. God the Father placed your sin and mine on Jesus Christ and judged our sins there. They were 100% paid for. All you can do is accept Jesus as the one who made this satisfactory payment on your behalf. Stop thinking you can do something to earn God's favor; simply accept Jesus Christ as the one who took the punishment you deserve. After Christ took the punishment for our sins, He declared it was finished, completely paid for; then He died and three days later He rose from the dead and is alive in Heaven today.
"For God so loved the world, that He gave His only begotten Son, that whosoever believeth in Him should not perish but have eternal life."
John 3:16
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"Verily, verily I say unto you, he that believeth on me HATH (possesses now) eternal life."
John 6:47
The moment you trust Christ as your savior, your sins are forgiven and you are given God's righteousness, His perfection. This allows you to enter into heaven.
"And by Him (Christ) all who believe are justified from all things, from which you could not be justifed by the law of Moses."
Acts 13:38-39