If they don't sell, you may stop selling them but those roducts are not failures, they are knowledge earned the hard way.
As you test the waters and try different products, remember that if they don't work, they are not failures, they are experiments on the way to success.
I read a quote once, and I am not sure who wrote it but to paraphrase, if it is not working, it doesn't mean it will end badly, it just means your work isn't finished.
No one, nothing, is ever perfect out of the gate.
Set a goal, set a deadline, and measure your progress.
Decide on a number, could be sales dollars, and then set a date, say 60 days, and then measure your daily progress. What gets measured gets done, and turns this from wishful thinking to an actual plan.
Measure your progress.
See what worked, see what didn't, redo, improve,and do it again.