Welcome!
There can be a lot of variability, even in “identical” materials (e.g., individual sheets of wood, even of the same species, can vary in density, grain and, thickness). There is also some variation among Glowforge machines. So, most regular Glowforge users do systematic materials testing rather than rely on discovering settings from other users.
Here is one very good method for doing that with minimal material use:
The digital nature of controlling devices like the Glowforge can obscure the fundamentally analog nature of what one is doing with it.
Edit: If you provide details on which model machine you are using and what material you are working with, someone here is more likely to be able to tell you where to start.