Coming up with an idea is hard. There are no shortcuts. Your original idea was not great. Clearly your board and your investors believe in you. Likely in their heart of hearts, they probably expected the FIRST idea to fail.

Now is exactly when they expect their ROI. So, do what YOU think is right. Get out of your comfort zone if you have to (maybe you already are). Search, brainstorm, seek.

You have investors because they believe in you and trust you with their money. Do not let them regret it. My guess is that you're already well equipped to pivot and find that next idea.

Tactically: Follow the money. In your previous effort - how did the money flow? Who paid who and for what? What were the pains or frictions involved with exchanging money. Solve that problem if it's possible.

Spontaneous meetups are probably reasonable at conferences, or colleges, or fairs. Can you pivot to a particular niche?