To have eternal life according to the Bible, need to invite Jesus Christ into our lives as our Lord and Savior to forgive our sins and repent from our sins henceforth.
1 John 5:11 – 12
And this is the testimony: God has given us eternal life, and this life is in his Son. Whoever has the Son has life; whoever does not have the Son of God does not have life.
1 John 5:11-12 NIV
https://bible.com/bible/111/1jn.5.11-12.NIV