Tricks to bring breasts closer together?

I'm a C cup, but my breasts are just about too far apart for decent cleavage unless I tighten the straps and pull my breasts up as high as possible, which I feel is a bit too obvious for my taste.

Has anyone got any tips or tricks (or sticky tape suggestions that don't rip off 5 layers of skin)?
Tricks to bring breasts closer together?
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