Building a new product or service relies on feedback from your target audience. Especially when initially testing quickly and repeatedly your assumptions and solutions.
Either create yourself or partner with an existing public establishment (a coffee shop), and have a place where your target audience can hang and get special treatment (free or cheap food and drinks, comfortable armchairs, daily reading materials, and anything that makes them feel it’s “their private club”), in return for their participation and cooperation. A place where you can have planned meeting as well as ad-hoc ones (initiated by either side.)
Doing a startup is emotionally and psychologically hard.
A service that offers continuous psychological help to startup founders and employees. You pick a permanent psychologist that seems to fit you and your team and get both fixed time with him, and ad-hoc help when you need it.
Make it a safer bet to start new businesses.
An insurance company specializing in insuring initial small investments in startups.