Before the Palm Pilot was the Newton.
Before Facebook was Friendster.
Before PayPal was Digicash.
Before Netflix was Microsoft’s WebTV.
Before DVD was Laserdisc.
Before iPhone was Pocket Crystal.
Before Chipotle was McDonald’s Arch Deluxe.
Before Juul was Premier Smokeless Cigarette.
Before Kindle was Rocket eBook.
Before Tesla was EV1.
You might have a good idea, but it’s the wrong time. It may be the wrong time because supporting technologies aren’t yet mature, or it might be a lack of cultural acceptance, or it might be government regulations. These things are out of your control.
Regardless, timing is everything.