Ideas can fail for a few reasons:
Bad idea
Bad timing
Bad placing

Take a look at failed ideas and think through if they will work again? People’s initial reaction to anything new is often NO! Very few people just grab on to any change. Take a look in your closet of failed ideas. Today may be the day where it will be a:
Good idea
Good timing
Good placing

Erie Canal vs Steam locomotive
Grace concern arose in NY over the horseless carriage as it may destroy the economy surrounding the Erie Canal. NY survived the paradigm shift to trains, and the canal became a thing of history (and awesome school field trips).

Cargo Plane vs Jumbo Jet
Boeing failed the large cargo plane competition. However, the ideas developed for the project turned into the most successful jumbo jet- the 747. One failed idea turned into an iconic aircraft.

100’s of failures vs 1 mistake
The lightbulb was discovered by a mistake after hundreds of failures.

The bottom line:
A failed idea may not be a bad idea. Sometimes ideas we had that did not work then may work now. And then again, they may not work now. But, you’re likely wiser and more experienced than you were on the first attempt.