Minecraft, nobody can come into my world anymore, why?

Minecraft, nobody can come into my world anymore, why? For a few weeks it was still going on but now everyone says my world wasn't there, but I was in my world. My world is also for multiplayer. (It was always like that) but now nobody sees my world anymore. My other worlds are exactly the same. Can you help me please? Got pocket edition version 1.16.40.02.

Do those who come to your server also enter the port number?

No, had never seen the port number

If you play it via LAN and open the world as a LAN game, the port number should be displayed in the bottom left corner of the chat.

They should also check that you are all playing with the same version.