Believing without evidence

I don’t understand how I am supposed to continue to believe something is possible when the evidence shows it isn’t working.

I am trying to launch a funnel to sell my online course.

The evidence I am collecting shows that my facebook ads aren’t working

How am I supposed to hold onto the belief that “I’m going to help so many people with this course” and “people really need my material” if the evidence shows that – helllooooo the ads aren’t working. Your belief is incorrect. Fix it.

When I see evidence like this, it makes me think that my goals are NOT possible. This knocks me down and it can take me weeks to start believing that it’s possible again.

Help please.