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Throw away the boxy sweatshirts. Take your blazer to a tailor. Buy the damn plunge bra.
Forget 100% cotton poplin. Look for shirting with elastane (2-5% spandex). Brands like Bravissimo, Pepperberry, or any "curvy fit" label add extra length to the placket and darts in the side seam. Throw away the boxy sweatshirts
Buy a shirt that fits your bust (usually a size or two up). Sew a small, hidden snap or a hook-and-eye clasp between the two problem buttons (usually the third and fourth from the top). Keep the outer button for aesthetics. Throw away the boxy sweatshirts
Run a small safety pin inside the shirt through the placket (the folded fabric edge) so it is invisible from the outside. Throw away the boxy sweatshirts