You can try John Robert Powers. They offer courses on dining etiquette, styling, and how to enhance one's image and self-confidence. Here's their site: http://www.johnrobertpowers.ph/courses/personality-development-program You can also check out Etiquette de Manille. They offer courses on dining etiquette, posture, confidence-building, self-presentation etc. Here's a link to some of their workshops: https://pauliantoine.com/workshops/
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I only know John Robert Powers as well. I think the company has really established its name when it comes to etiquette and self-confidence workshops. It's a go-to option for your needs