Blog page does not show submenus and posts

Hello!

I recently updated the theme on my website. After this, the blog page doesn’t show the submenus and the blog posts preview it used to show before. I was not able to solve this problem.

On the old theme the taxonomy was like this: each submenu had a number that I had to write to the menu it belonged to. Now, with the new theme that is no longer available and the page doesn’t show anything.

Thank you!

The page I need help with: [log in to see the link]