God's common grace is for all. Common grace gives rain with fruitful seasons to all people. Every provision we all have is by God's common grace. However, God's saving grace is only for believers in Christ. God works in and through us to do His will by grace alone. John Newton referred to God's saving grace as "amazing grace how sweet the sound, that saved a wretch like me."
God's amazing grace is offered to all, because we have all sinned (Romans 3:23). There is no way we can merit nor earn the favor of God. It comes to us only as the gift of God freely received. "For by grace are you saved through faith, and that not of yourselves. It is the gift of God, not of works lest any man should boast" (Ephesians 2:8-9). Faith in Jesus Christ receives God's amazing grace. Don't fall for the idea that we can somehow be good enough to merit God's gift.
The only way that we can have a personal relationship with God is by grace alone. He must reveal himself to us and in us. That has been appropriately called amazing grace. It's not what we do for God. It's what God has done for us in Christ. All that we are or ever hope to be is by God's amazing grace.
Your testimony may echo the words of the apostle Paul,"But by the grace of God I am what I am, and His grace toward me was not in vain" (First Corinthians 15:10). Grace gives all the glory to God. It's always by God's amazing grace and never earned by our works.