Step 1: back yourself into a slope
Step 2: Build up speed for 12 hours.
Step 3:

Step 4: You're now 60 years old. And in a different universe.

Now, you have to climb the Everest and step there facing North for at least 36 hours to gain momentum.
Now jump and you will be at your birth but with all of the EXP points you had before applying the glitch.
Not very useful for speedrunning but then the game becomes easymode