[Cerrado] Delete WPML from web site

Background of the issue:
I am trying to remove WPML from my website, enlace oculto, because it has become too heavy with five languages and many products, causing the site to slow down over the past two years.

Symptoms:
The website becomes fast when I disable WPML and its plugins, but disabling it causes the entire website to become disorganized and shapeless. WPML takes up more than half of my server space, leading to conflicts between plugins and affecting sales.

Questions:
How can I remove WPML and its applications while keeping only the primary language, Portuguese?
Why does disabling WPML cause the website to become disorganized?