I was trying to build a scheduling tool since the beginning of 2020 before I decided to build a full-fledged calendar called Atomcal.
I failed to launch that iOS scheduling app as nobody gave any positive reviews on the beta test flight. After this failure, I got busy working for another startup before leaving it in 6 months due to unforeseen circumstances.
This is when I had to go back to my roots (~ August 2021) to learn from my mistakes and start again. This time with more planning and a solid design foundation (and experience).
I wrote a blog post on my learning from that failure to build back in Jun 2020 https://xtabbas.com/next-step-when-design-fails/