Bra/Tape for my dress

Hi everyone, I am a bridesmaid in a wedding this summer and this is my dress. My only concern is that I have more of a saggy DD b00bs and I’m unsure how I will lift them up and together for it to look decent. I have tried those sticker bras that pull them together but my b00bs seemed too heavy and they were still falling down. I can’t really wear a normal bra, even with clear straps, so I’m wondering if you guys have any recommendations? I was thinking maybe boob tape/KT tape, a longline strapless bra, or even having cups/support sewn into the dress by a seamstress. Has anyone with a larger chest found something that actually works? I still have a couple months so I’m open to trying different options. Thank you in advance!!!