Selling or not?

I have been successful then unsuccessful with selling anything in my life on and off.

I am wondering what makes an phone menü (you can select with your analoge phone numbers in) valuable to McDonalds in 1995 and a brilliant face cream not even interesting in 2024.

What makes the difference? The audience the approach the product?

Or me? Because I am the one who sold McDonalds the first Menü for phone in 1995. And I was very successful in it.

What could be the difference maybe the niche? Or that i picked there the right product? Please write in the comment thank you!!!