When the Bible speaks of election, it is often in the context of a task or service, not in the context of being elected to be saved. It doesn't mean one is chosen to be saved forever, but chosen for a particular task. Consider the following three examples in the Bible:
1. King Solomon's task
King David wanted to build a temple for the Lord. But God told him that not he, but his son Solomon, was chosen for this task:
2. Paul's task
Paul was also chosen for a particular task, namely to be a missionary:
3. The Christian's task
If a Christian were only destined for eternal life, only life after death would matter. But this isn't true. A Christian is destined for more. We are chosen for a glorious task on this earth; we are chosen to tell others who God is and to testify of His name:
Election for a purpose or task is never intended to be at the cost of others, but God chooses one person or a group of people to be a blessing to others.
But this never means that those not chosen for this particular task will perish forever. An example is Ananias (Acts 9:10): he was not chosen to be a missionary to the Gentiles, but he was saved for eternity.
A thought to ponder on your own
Read John 15:16. What is the task God has for you in His Kingdom?