Every company needs to overcome lack of product/market fit.
When you start a new company, the key product/market fit question you need to answer is whether you have discovered a nonobvious market opportunity where you have a unique advantage or approach, and one that competing players won’t see until you’ve had a chance to build a healthy lead.
Most nonobvious opportunities arise from a change in the market that the incumbents aren’t willing or able to adapt to.
The only way to truly prove product/market fit is to get the product into the hands of real users. But entrepreneurs can and should do their research, and try to design their business model to maximize their chances of achieving product/market fit as quickly as possible.
Product/market fit discussion
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To subjectively evaluate product/market fit, tap your "network of intelligence" and get your product in the hands of your personal network. Add some people below you know, see if they meet some basic qualifications, and send them an e-mail asking for feedback.