WHAT HAPPENS TO THOSE WHO ARE LEFT BEHIND IN THE TRIBULATION? WILL THEY HAVE A SECOND CHANGE TO BE SAVE?

I am constantly wondering happens to those that are left behind in the rapture and face the seven tribulation? Would they have a chance to make heaven, if they manage to avoid the Antichrist system, such as the mark that would allow to buy and sell that God clearly says to avoid it in Revelation 13:17, which state the following, "Re 13:17 speaks of the name of the beast. It has, then, a name. It also speaks of the number of its name. Its name, then, is some number. We wish to discover its name, and if we can count the number, we will find its name. The number of the beast, that is, the number of its name (Re 13:17) is the number of a man, and that number is six hundred and sixty-six."