A lot of good questions, Lambano.
1. death as been overcome by Jesus - when you die you are going to be given a certain judgment by God and given a spiritual body once you leave this world.
2. All people have been reconciled to God through Christ, they have been saved from hell, death, Satan and his demons, and their debt of sin was paid for by Jesus - it’s just a choice people have to individually make, Will I seek out the things of God or only seek out what the world offers. (There are the faithful and the faithless, and I believe faithless people have a place outside of the kingdom.
3. The wiping away of every tear is coming by spiritual comfort founded only in looking to God and looking to the eternal aspects of life and not just the material. We all suffer physically pain, illness, sicknes, sadness all comfort founded in the spirit.
4. I personally believe live in the Age of fulfilment where everything has been taken care of by the victory of Christ. The age of the first generation of believers that were the bride is over, now it’s just up to the individual Will they seek out the things of God while they live in this life or not, it is totally dependent on them as an individual.
The Kingdom of the Heavenly Jerusalem will increase forever it will never stop.