convenience sampling yields bast when it is applied until there is saturation in the responses

I think for your research area, Convenience Sample should work fine.

I would rather suggest that your circumstance (availability of potential respondents data and their nature, resources at your disposal and what you wish to establish among others) guides the sampling method u adopt. For example; if it is the entrepreneurial intention of students random sampling would be better because their list is easily obtainable from the school authority, but if it is that of rural women where the whole locality u are conducting the study in have the features needed by the research and no list of the locals available then convenient sampling is okay.