The "true salvation" is only for "true Christians", the little flock, the elect (Luke 12:32; Col. 3:12). Those invited to share with Jesus in His reign over the earth (2 Timothy 2:12; Rev. 20:6). Well, if they're reigning, who are they reigning over? The world of mankind, the same world that Jesus died for, after all, He "gave Himself a ransom for all, to be testified in due time," (1 Tim. 2:6), that "due time" is during the Kingdom.
YOUR job, if you believe you have been called, is to be "more diligent to make your call and election sure" (2 Peter 1:10) because those who are "faithful until death" will be given "the crown of life." - Rev 2:10
RR
I likely hold a different eschatological perspective than you do, and therefore interpret verses such as 1 Timothy 2:12 in a distinct way.
(2 Timothy 2:11) The saying is trustworthy: If we have died with him, we will also live with him;
(2 Timothy 2:12) if we endure, we will also reign with him; if we deny him, he will also deny us;
(2 Timothy 2:13) if we are faithless, he remains faithful, for he cannot deny himself.
Spiritually and in my heart, I have already died with Christ. I live and endure with him now in his Kingdom, as my spirit confirms. I am actively running the race of victory today. This is a present lifestyle, not something reserved for the future. I have access to and live with Christ and the Spirit of his Father in the Kingdom today, not at some later time. I do not believe that reigning with Christ is something that happens in a distant future, which is the common eschatological view.
The talents and gifts I have been given are used and developed now, continuing into the future—not only after death.
Indeed, I am part of the first resurrection—my spirit is alive today, not in some future era. The second death holds no power over me now.
Regarding 2 Peter, I do not see it as a task or burden. I exercise diligence today with what I have been given. This diligence flows naturally from my rebirth in Christ—it is a spontaneous growth. If it felt like a job or chore, I would question whether I am truly reborn.
Today, I partake in the divine nature of the Father, even if only in a limited way, much less than the full measure given to His Son.
(2 Peter 1:3) His divine power has given us everything we need for life and godliness through our knowledge of him who called us by his own glory and goodness.
(2 Peter 1:4) Through these, he has given us his very great and precious promises, so that through them you may participate in the divine nature, escaping the corruption in the world caused by evil desires.
(2 Peter 1:5) For this very reason, make every effort to add to your faith goodness; and to goodness, knowledge;
(2 Peter 1:6) and to knowledge, self-control; and to self-control, perseverance; and to perseverance, godliness;
(2 Peter 1:7) and to godliness, mutual affection; and to mutual affection, love.
(2 Peter 1:8) For if you possess these qualities in increasing measure, they will keep you from being ineffective or unproductive in your knowledge of our Lord Jesus Christ.
(2 Peter 1:9) But whoever does not have them is nearsighted and blind, forgetting that they have been cleansed from their past sins.
(2 Peter 1:10) Therefore, my brothers and sisters, make every effort to confirm your calling and election. For if you do these things, you will never stumble,
(2 Peter 1:11) and you will receive a rich welcome into the eternal kingdom of our Lord and Savior Jesus Christ.