"Conventional methods" refers to traditional or commonly used approaches or techniques that are familiar and widely accepted in a specific field or situation. Full definition
While I don't use conventional methods of treating illness, I'm also not in favor of letting an ill person suffer any more than is necessary. (wellnessmama.com)
Most job hunters use conventional methods for obtaining interviews. (careerdigital.com)
Each eruption has a distinct chemical signature that, along with conventional methods of carbon dating, can be used to associate each layer of volcanic material with a particular eruption. (scientificamerican.com)