Thank you for your guidance! Here’s a revised color palette featuring your chosen colors with a dark purple:

 <Vibrant Café Contrast> 
1. Dark Purple - 
                            
                            #4B0082
                         - A rich, deep purple that adds a sense of elegance and depth, creating a striking backdrop for brighter colors.
2. Yellow - 
                            
                            #FFD700
                         - A vibrant, sunny yellow that brings warmth and positivity, reminiscent of sunshine.
3. Turquoise Blue - 
                            
                            #40E0D0
                         - A lively turquoise that adds a refreshing and energetic touch, brightening up the space.
4. Bright Fuchsia - 
                            
                            #FF1493
                         - A striking and bold pink that adds playful energy and vibrancy.

This palette combines dark purple with bright yellow, turquoise, and fuchsia, creating a dynamic and cheerful atmosphere for your café. The dark purple serves as a strong foundation that enhances the vibrancy of the lighter colors.

How do you feel about this combination? Are there specific areas where you envision using these colors, such as walls, furniture, or decor?