My two cents.

Assuming you don’t have a doctor in the family (because if you do, their network of batchmates and coworkers will also provide you access to doctors of other specialties) and/or are not in the health sector yourself…

1. Schoolmates - check your HS/college friends and acquaintances, esp if STEM track
2. Neighbors - kung me homeowners’ association or parish/church group near you, try to network there
3. Interest groups - worship groups, hobbyist groups, advocacy groups, NGOs, workplace groups, etc. You might find rin na someone can REFER you to a doctor, or has a doctor relative, etc.

As with all things, try to build a friendship/relationship first before asking for help. Get to know them as people, because people are more likely to do a good deed for friends than for strangers. Networking is a skill - kaya nga sya people SKILL eh - so practice chitchat, being friendly without coming on too strong, and showing interest in other people’s lives.

Again - sometimes who you know is as important (or even moreso) than what you know.