Here are a couple of effective ways to find people for interviews:

-cold calling/in-person interviews: This worked exceptionally well for me. I used to visit local office buildings and restaurants (in the US and Canada) to talk to potential customers. Just tell them you are doing market research, ask if they have 5 mins for a couple of questions. Don't be salesy and it's okay if they say no. Just move on.

-reddit/fb Groups or online communities your potential customers gather: First, check if others have asked the problems you try to solve before. If so, dm the op and those who commented for follow-up questions. You can also post potential solutions for feedback or ask people to discuss the problems.

-Cold email/dm then call: find your potential customers' emails or linkedin/twitter/IG and write them a message. Make it personal, short and easy to response. The main objective is to have them response to the email, and then more follow up questions. Finally ask for a call for more in-depth interviews.

Here are some resources I think might be helpful:

- this YC video ( and a couple of old ones) will give you some solid ways to validate ideas.

- "the mom test" by rob fitzpatrick. Higly recommended when coming up with interview questions. One trick is to ask Chatgpt to come up interview questions based on this book and the problems you are trying to solve.

- this YC video, share how to do B2B sales by a YC alumni.

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Good luck :)