his workmanship will be evident, because the Day will bring it to light. It will be revealed with fire, and the fire will prove the quality of each man’s work. — 1 Corinthians 3:13

Endurance isn't the way you earn salvation; it's the evidence that you've truly been saved. He who endures to the end will be saved. The ones who fall away were never truly rooted in the first place. But those whom God has called and justified — He also glorifies. So keep going.