It sounds like the Dems are pre-printing ballots in China, with all your voter informatoin on them, but the fake ballots have a vote for Biden. This is why they are pushing absentee mail-in ballots: Dems will go through all mail-in ballots in a back room, remove the ballots that vote for Trump, and replace them with the fake ballots. The pretext for pushing absentee ballots will be "more cases of the beer virus" which of course will be mostly fake, but greatly exaggerated.
So you need to mark your ballot somehow to authenticate it. But you can't use any dark mark like pencil or pen because that will cause the scanner to reject the ballot. Make it a complex mark, not just one line, where only you know what it is.
So take a pen cap, or something else pointy, and write on the paper making a divot or indentation, but leaving no black or colored mark. In a pinch you can use the edge of a coin.
Now when it comes time to do a recount, ask to see your ballot because you suspect voter fraud. When they hand you your paper ballot, look for the mark. If your mark is not there, it's a fraudulent ballot.