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978 B
the bottomless pit
This is an extremely deep narrow hole. Possible meanings are 1) the pit has no bottom; it continues to go down further forever or 2) the pit is so deep that it is as if it had no bottom. See how you translated this in Revelation 9:1.
Then it will go on to destruction
The noun "destruction" can be translated with a verb. Alternate translation: "Then he will be destroyed" or "Then God will destroy him" (See: rc://en/ta/man/translate/figs-abstractnouns and rc://en/ta/man/translate/figs-activepassive)
it will go on to destruction
The certainty of what will happen in the future is spoken of as if the beast were going to it. (See: rc://en/ta/man/translate/figs-activepassive and rc://en/ta/man/translate/figs-metaphor)
those whose names have not been written
This can be stated in active form. Alternate translation: "those whose names God did not write" (See: rc://en/ta/man/translate/figs-activepassive)