I've validated an idea for the last month and got no results. Give up / continue?

A month ago I posted a story about the decision to start productized service idea validation.

Before the start I tested this service with my current client but from other business. The idea itself is a service which helps founders get rid of chaotic product development planning and messy backlog. It took ~15 hours to hit the result, reduce their planning session by half and put everything in order. I've got a positive feedback and decided to give it a try.

Since the client is a founder of YC backed startup I decided to focus on founders from the latest YC batches (W21, S21)

I decided to outreach them on Linkedin. The offer was in following: we were ready to spend 12-16 hrs to clear up the development processes in exchange for feedback. It contained the audit of the current processes, personalized planning system creation, prioritization and tasks estimation framework and collaborative planning of the next 3 sprints.

I've sent 522 invites which allowed me to message 164 founders and got 31 conversations. In total, 5 calls had booked but 3 founders ignored it and never answered messages again. Another team was well organized with their processes so we haven't found any space for improvements. The only startup which we managed to work with and develop a system stopped following it after a week or so. They started to respond our emails once a week so it was a red flag for us. No feedback.

I know that the service is valuable. I have seen it helping the team to overcome messy processes after the seed round and launch. But it was too naive to assume that it would be so easy to get the founders' attention and stand out from the dozens of different offers they receive every day. Even if you are not going to charge a penny.

I understand that it's useful to create a content around the service, showing the use cases, problem solving, etc. However, the fact that cold outreach validation with the right target audience brought 0 results doesn't make me a believer that the service has a chance. Even with the content.

Either nobody cares or the service isn't packaged well.

The lack of at least some kind of result is very demotivating. However I'm not used to giving up so easily. Now I will focus on other ideas, but if the opportunity arises, I will pitch the service.

What would you do in such a situation? Any feedback is appreciated.