Increasing general font size

Hi there,
you can try this

body, .entry-content p{
 font-size:20px;   
}

in your custom CSS box under Appearance ? Customize ??Additional CSS

Let me know if this helps.

Yes, it did work. Thank you for your help.

Additionally, is there a way to adjust the heading font sizes with the paragraph font size as well? Another way to phrase my question would be how can I keep the ratio of the heading font sizes with the paragraph font size like the original format?

Glad I could help!

There is no automatic way to control the aspect ratio of headings and paragraphs.
So you will need to figure the best size for your headings by yourself.

Try this

h2.entry-title{
font-size:50px;
}

to change the listing article headings and
this

h3.widget-title{
font-size:20px;
}

to change your widget heading size.

Great, thank you.

You are welcome ??