How does my world cross over to another world?

First, open my world into any archive, and take out the portal at the end and the last eye of the shadow;

Second, put a portal as shown in the following figure on the ground, as shown in the following figure:

Third, the last eye of the shadow should be placed in the middle of the last portal, as shown in the following figure:

Fourth, when it is full, it will look like this, and the portal will open, as shown below:

5. Jumping in will load the world, as shown in the following figure:

6. In this way, we successfully crossed into another world, as shown in the following figure: