Physics genius enters

That's not the case.

1. When very close to a black hole, the gravity is already quite strong. When you enter the event horizon, you are stretched into a spaghetti shape and cannot survive. And if you carry a watch, that also stops.

2. The turn you are talking about is the "earthworm hole" consequence of falling into a black hole! . If there is a "wormhole" and you survive with advanced technology or magic. The hole is just a solution.

3. Some solutions to general relativity allow you to see the naked singularity when you fall into it, avoid it and fall into the "earthworm hole", but! These solutions are highly unstable, that is to say, if your existence changes this, you will hit a singularity, just like the brother upstairs said! This means that the singularity is always in your future.

4. The theory of relativity has an observer problem. Time will not go backwards, otherwise it would not comply with the second law of thermodynamics, which I will not explain here. I just want to say that you are "lucky" to go back, and you will see another you. For the original you, your time will continue to pass. For this other you, time continues to pass. But for your past companions who did not enter the black hole, you are in the past.

5. If you do all these things, the universe will not be what it is now. The universe becomes an infinite loop with multiple backups!

6. To put it simply, the structure of you as a human being does not allow it. Maybe you can just be a particle, haha.

Any questions? If you feel the explanation is not clear, please add questions