The GNOME Software center shows few apps

so, now the GNOME software center shows few apps. All I did is install a few apps, mostly games like Five or more, Connect 4, apps like Evolution, that email client, then uninstalled them and now I have fewer apps than before available to install. Killing gnome-software won't fix it. Seems nobody has reported this in this Q&A, so here it goes some proof.

How do I make it so it shows more apps like audio stuff? (yes I'm spanish don't judge me please) PD None of the answers here work. I've tried them and it still has only got 8 apps.

Afterwards I've got this tough dude in the lower corner of the screen:

Translated means: "An error has occurred while checking for updates". Now I did what it said here and it's worse. Thanks, reporters! Anyway, I made sure that my system was up-to-date, it is. And so, the icon is still there.

Reinstalling won't help either, stuff is still the same after a purge reinstall.

I meet the same problem. And I find a solution on another forum thread. It is work on my computer. The below is taken from another thread.

$pkill gnome-software
$sudo rm -r /var/cache/app-info
$sudo appstreamcli refresh --force --verbose

The link of solution from