A few ideas:
- As others have suggested, check Meetup and other appropriate sources for entrepreneur-focused meetings that are already happening in your area. Here in Seattle, GeekWire has a good calendar of recurring local events.
- Develop relationships with 3-5 people who have already been through what you're experiencing (not necessarily in the same industry/space), and ask them to become your "personal board". You may or may not offer them compensation for their time, but trying to get a monthly f2f/video meeting with all of them, to discuss any issues you're facing and questions on which you want their opinions. This is similar to, but not the same as having advisors for your startup, since your "personal board" is focused on helping YOU, and indirectly helping the business.
- Develop relationships with 3-5 entrepreneurs that have businesses which complement yours. For example, if your startup is online medical billing, find another startup focused on online patient records. Since you're not competing, meeting together to discuss issues across your shared industry and customer segment can be very valuable.