However, I realized that the fonts on my website are showing way bigger than usual. I am not well equipped with CSS and other things, so really don’t know what would help.
The font size of post content is changed by the wp-ultimate-recipe plugin that you are using on your site as shown in the attached screenshot. The plugin has applied the font size property very specific that we can’t change it using CSS code so you have to contact the wp-ultimate-recipe plugin developer regarding this.