Minify CSS file to my website

Hi all,
this is the website Safefood 360°
that when I used SEMrush to check the issue.
It tells me that I didn’t minify my css file on the wordpress.
Since there are versions=5.0.1 and 6.0.1 I believe that can be minimise and enhance.
Is that meaning I need to mannually delete the old css file, to prevent too many css file loading on our website?

The current website speed really made me feel struggle and I want to enhance this.

Page URL Resource URL Resource Type Discovered

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/css/grid.css?ver=5.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/css/base.css?ver=5.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/blog/blog.css?ver=6.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/postslider/postslider.css?ver=6.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/comments/comments.css?ver=6.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/slideshow/slideshow.css?ver=6.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/contentslider/contentslider.css?ver=6.0.1 CSS 10 Aug 2022 (16:33)

Home – Safefood 360°
https://safefood360.com https://safefood360.com/wp-content/themes/enfold/config-templatebuilder/avia-shortcodes/gallery/gallery.css?ver=6.0.1 CSS 10 Aug 2022 (16:33)