WordPress page update and configuration. Seo. Search Engines.

Hello,
I have a WordPress page built but I need to update the content (layout), SEO and adding it to search engines, so it is fully visible when searched (both main page and subsections).

The wordpress template used for the site is this one: Bauhaus – Architecture & Interior WordPress theme – Just another WordPress site (paul-themes.com).

Please make my site as functional as the one in the template. I will provide constant feedback so the changes are accurate.
All changes need to be done so they work on the computer and mobile versions.

I made a initial list of things to do with the page:

Managing the SEO options – so it is fully operational and optimised;
Fixing the language versions of the page (error when switching versions);
Building „News” section as
Deleting the black language button;
Fixing the site crashes;
Making all panels with information clickable anywhere when pointing on them (as attached)
Making site visible in Google and other search engines;
Adding keywords;
Enabling switching between panels AFTER you click on them;
Add arrows so you can swipe panels easier.

English or Polish speaking freelancers welcomed.

The said website to work on - www prosta-akcyjna.pl