Haha, I see. There’s some really good ex-Mormon jokes about how the highest tier of heaven (Celestial Kingdom) is boring and white and reverent and then the third tier (Telestial Kingdom) is a 24/7 rave. If given a choice on where I want to spend my afterlife, I’d probably consider the company I’d end up spending eternity with.
General connotation of Hell though is that it’s a miserable place
It’s a bit complicated, but the answer is it is sort of possible for anyone who is dead and didn’t have their ordinances done to get to the highest kingdom. Mormons famously baptize dead people, they also do other ordinances for dead people. The belief is that it allows the dead person to then accept or deny the ordinances. They believe that in the afterlife before resurrection there is still the opportunity to be taught the Mormon gospel. That combined with someone doing your ordinances for you and you’re good.
They believe dead people are doing missionary work to other dead people in the spirit world before resurrection (which I think happens after the second coming). I’ve heard that the second coming won’t happen until everyone (alive and dead) has had the opportunity to accept the Mormon truth.