What happens to the soul that is lost? Or gets lost?
Sorry Genesis I have a time of getting your questions lost in the shuffle
We are not given a lot of detail as to what that looks like. It is described as outer darkness, condemnation, destruction and punishment to name a few.
The soul is one's agenda. What that person desires out of life. God wants us to desire what He wants, so that His will is done, not our own.
There are Christians that don't care to do God's will and still want to do their own thing. And that attitude will not work in the coming kingdom nor eternity.
So instead of the folks getting it straight in the 70-80 years or however long they live after salvation on this earth they will have to learn that lesson for a 1,000 years, because we will be doing God's bidding in eternity, whatever that might be.
One of the best examples to see is where the Lord said He was going to and did destroy Soddom and Gomorah, but the angels that came to Lot said they were going to destroy the two cities.
What happens is God declares something to happen and appoints someone to carry out the action and it is done in such a precise manner that it is as if God is the one doing it. And so if we aren't interested in obeying God now there isn't anything that magically happens to us when we die that makes us want to obey Him then, so those that don't learn it now will have to learn it then.
We will be ruling under Christ. So if we can't follow orders here why would we follow orders in that 1,000-year period?