[Risolto] I translated into 5 languages, which increased MySQL usage by 700MB. How can I solve this problem?

Background of the issue:
I translated my website into 5 languages using WPML, which resulted in a significant increase in MySQL database usage.

Symptoms:
The MySQL database usage increased by 700MB after translating the site into multiple languages.

Questions:
How can I reduce the MySQL database usage after translating my site into multiple languages?