All old Minecraft worlds no longer appear.

I have had same phone since last October 2021. I do not have external storage. I got in Minecraft, went to choose my world and all my worlds were gone. I was directed to recover my worlds which where not in my files. I got out, into files and searched all variations to no avail. They are not there. I created a new folder to start over which works here forward. But all my previous worlds are gone. My skins and such are there but not worlds.