You already have it. The mark of the beast is the fleshly nature of man, toiling on the earth, knowing no rest night or day, subject to disease and death, forever and ever until we can ascend to heaven.
No Mark of the Beast on anyone - Yet.
What is on everyone is what we are ALL born with = SIN.
Therefore, just as through one man sin entered the world, and death through sin, and thus death spread to all men, because all sinned
Romans 5:12
And you
He made alive, who were dead in trespasses and sins,
2in which you once walked according to the
[a]course of this world, according to the prince of the power of the air, the spirit who now works in the sons of disobedience,
3among whom also we all once conducted ourselves in the lusts of our flesh, fulfilling the desires of the flesh and of the mind, and were by nature children of wrath, just as the others.
Ephesians ch2
Anyone who receives the Mark of the Beast will not be forgiven = never.