You may adapt office space. Choose a working environment that suits your team’s needs, whether it’s a traditional office, coworking space, or remote work setup. You may ask the landlord for changes (best done before moving in because the landlord may be willing to help to acquire a tenant; may involve a minimum rental period or some other cost sharing).

You may Say No: Decline opportunities or partnerships that don’t align with your vision or values. Set boundaries to maintain focus on your core objectives.

You may experiment. Test new ideas, marketing strategies, or product features without the need for perfection. People always suggest A/B testing, but that is not the most effective may of doing it. See You Are Not Measuring What You Think You Are Measuring.

You may seek help, for example, reach out to mentors or join startup accelerators for guidance. One well-known accelerator known to be very good at this is Y-Combinator and they have good learning resources called Startup School.

You are allowed to pivot and change course. Maybe obvious, but it may not feel like that when you already have some customers or made presentations to investors. 

You may fail. Failure is part of the learning process and can lead to growth. You don't have obligations to your investors for failing (if you tried hard). 

You may share your failures openly, e.g., to build a culture of transparency and continuous improvement.

You may get a co-founder (there are places like this). And you may also break up with your co-founder or buy them out.

contra evidence, I 've been trying to make a vein finder device and multiple Chinese manufacturer on alibaba have been cold to luke warm to talk to me.

been trying to find out how to export squid from australia and both the fisheries and the trandport companies have been ignoring my emails

granted I probably sound totally unprofessional in some way as I don't have much idea how the process look like.