Advice on which sampling method to use

Hi guys! I really need help!

Suppose that I have a research topic: “Jakarta citizen’s trust in the quality of local food products”. My research question would be: ‘what effect does gender/age/income/education has on customer’s trust in the quality of local food products?’

Then, which sampling technique should I use?

I know that it’s only possible to use non-probability sampling, because otherwise it would cost a ton and I have to know the contact of everyone in the city (which I don’t). I was thinking of using quota sampling, but I got really confused because I have so many variables: gender, age, income, education. And I’m not sure how to group the sample, plus how to exactly do it.

Any advice would be appreciated. I am desperate. Thank you very much!!