Which of these famous inventions was initially rejected by its target demographic, with its inventor receiving over 5,000 rejection letters before finally achieving market success?

Throughout history, many groundbreaking products were initially rejected or underestimated by their target markets. Some inventors had to radically change their marketing approach or pivot their customer demographics to achieve success. This trivia explores one famous product that faced significant rejection before becoming a household name, highlighting how understanding customer demographics can make or break an invention's success.

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Post-it Notes (originally called 'Press 'n Peel')
Dyson vacuum cleaner (rejected by all major manufacturers)
Instant Pot (initially failed to connect with home cooks)
WD-40 lubricant (took 40 attempts to perfect and was initially rejected by hardware stores)