To know the right product market fit you need to talk to your target customers. That's the best way.

Ask them things like:

what are your biggest challenges when it comes to <your niche>?
why is this so big problem?
what is going to happen if you don't deal with this?
how do you think you can deal with this?

When you find out what are their biggest challenges and pain points, create a product that helps them to solve them.

Ask them again for an interview and present them the solution. Look if they'd buy it. Search for objections why they won't use it. See if you can eliminate them in some way. Pivot your offer according to that.

Talk with at least 20 prospects per week and present them what you're doing and what's your progress. Ask for feedback all the time. Then, and only then you're going to build a great product.

By looking for feedback you eliminate guessing. And that's really important for success.

Feel free to schedule a call if you want more help with the product launch. I'd love to share my experience with you when it comes to identifying and connectin with your niche, how to validate your idea, get to product marketing fit and launch your thing successfully.

Wish you all the best,
Martin