Life after death

Something iv been curious about lately is:

What is your belief regarding the spirit after death. As in being “trapped” in certain astral realms such as different heavens or hells. I plan on experiencing it my self when I get the MST course. Are spirits/entities bound to the planes they reside in, why would they not work their way to “God planes”?

Like the common belief regarding the hierarchy of the planes, why would the spirits such as Dukes or lesser spirits not try becoming “Gods”.

I think they are Gods already, in their kingdom perfectly suited on their characters/powers/roles etc.
Everything has its own reason and utility to exist just as they are and chosed to be. IMHO.