Help! How to tame the boobies & avoid the 'pancake' situation

I bought this dress recently online, hoping that the size would be small enough for me. Usually I'm an XS and 32C in the chest area. Although the dress is quite stretchy, it's still unexpectedly tight on me, but the main issue is that one of my boobs does this sort 'overfill' and becomes a split pancake. You definitely can't wear a normal bra with the dress which sort of fixes the issue but I thought if any of you knew how to fix/ bring the boobs together (maybe idk?) and give them a bit of a lift. I heard taping them can help and I tried using tape at home as a trial, but that didn't turn out so well... Anyway if anyone knows a way I can try to fix this please share this would help so much xxx