in Hebrews 13:7, is the rendering of the unusual Greek word ekbasin, meaning “outcome”, i.e., death

It occurs only elsewhere in 1 Corinthians 10:13, where it is rendered “escape.”

End of heavens and Earth—Matthew 24:35; Luke 21:33; Mark 13:31; 2 Peter 3:10-13 (“the heavens shall pass away with a great noise, and the elements shall melt with fervent heat, the Earth also and the works that are therein shall be burned up.”)

The end of this universe takes place at the end of the Millennium.