When I check the status of my web with the applications that exist for it, it indicates the problem, I would like to know if there is any way to be able to fix it.
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Same for CSS, removing it will break the appearance of your page.
Some plugins can help improve your site speed by minifying, combining and moving some of the render-blocking code; however this is far beyond the scope of theme support.
You will find a lot about this if you search for “improve pagespeed in wordpress” and similar terms if you want to learn more about it.
Please note however that even though you can always improve your site; automated checker such as google pagespeed insight will always find some “problems”.
Completely getting rid of all of them is possible but at the cost of a lot of complicated and hard work, and usually provide little to no additional benefit.
On the topic, you may find this article interesting: https://premium.wpmudev.org/blog/100-score-google-pagespeed-insights-not-happening/