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Hi. I looked at your blog and if I’m not mistaken you are using this theme that is from 2016? https://projectdmc.org/themes/ari/
The additional <p> tags are not produced by the plugin, but rather your WordPress installation. Best recommendation I can give is to use a contemporary theme that supports modern features like the WordPress Gutenberg block editor.
When using either the “custom HTML” or “shortcode” block you will not get the <p> tags. Not sure what the corresponding widgets pre Guttenberg were. IIRC there was a “custom HTML” widget element too. Maybe also a shortcode element? Using those instead of a WISYWIG element will get rid of the <p> tags.