Website optimization and positioning of piesografia.pl website with improvement of website and store design

I am looking for a trusted person to help optimize my website piesografia.pl.

I am keen on getting the SEO right and optimizing it.

I also need to improve its responsiveness and design of the site so that it displays correctly on different devices. At the moment, the site on mobile devices is not stable, the font is misaligned, on the blog also not quite displaying everything correctly.

I also have a problem with the correct display of the logo on the store and the site in general on computers and mobile devices.

The current template on the site is based on WP Bakery Builder (HTML + CSS) and an overlay by the person who helped me create the site.

The template is Reflector Theme from themeforest.

My business is animal photography, selling vouchers for photo shoots and workshops, and author presets.