Best form of validation is going to potential customers, getting verbal LOIs (letters of intent) minimally they don’t need to be formal)
Consider the ICP for your idea. You will need to reach them to validate it.
The key is to validate it as quickly as possible
Finding Your Potential Customers
Your Current Network/Networking:
Leverage your personal and professional network.
Attend industry events and join relevant groups.
Paying For Leads:
Can find marketing and sales specialists on Upwork and Fiverr who have already done all of the work for you. The will send you emails and contact numbers of hundreds or thousands of potential customers you can reach out to.
Audience:
If you have a brand or existing customers/ clients
Partnerships and Alliances:
Identify complementary businesses and explore partnerships.
Cold Outreach:
Conduct targeted email campaigns and cold calling.