Do you know a similar approach?

So i am planning to write a proposal research. It is about using the target language all the time in classroom in specifically higher educations ( as in universities, but not high or middle school )

When i looked at “the direct approach “ it is not really what im talking about, in a research i read called “the direct approach” it was a pdf on google made by Saja Wathak Husseen for the university of Diyala. She explained that the teacher in the direct method does not explain but demonstrates to students. Now i do agree that the teacher shouldn’t translate interlingually. But how come A TEACHER DOES NOT EXPLAIN AND DEMONSTRATE AT THE SAME TIME. Thats a basic teacher job, maybe they could simplify the thing they are teaching so students can understand but u tell me not even explaining? It is a dumb approach. Or maybe i dont fully understand it because i only know it as an approach that came after GTM and i didnt study much about it when i took applied linguistics.

My idea for the research is simple, is that i wanna explain why we in EFL universities must speak in the target language at all times in classrooms. Bc i have this basic logic, if you are in English major then you should just speak in English. Even if you can’t explain something in the target language, you should then try to define it in the target language and if it wasn’t understood at all maybe then you could use the first language, for this and for necessity purposes. Im not gonna talk about speaking outside the classroom bc thats a little bit difficult when you are in a country that speaks only one language and the students within the university they dont really use English outside the classroom inside the university especially in my university. I was in a different university when i was a freshman, and it was the same case but there were this group in class they used to talk in English with each other so in that uni there was a little difference you may say. Now, i might mention that some students struggle to speak english at all, because there are students in english that are zero in english which is fine at the beginning, but also it depends. Bc i took 3 years to just have a basic english which were the years before being in uni i was acquiring the second language and when i became a freshman i sucked badly but then now it kinda got better. So imo, you need to have the silent period not in your freshman year tbh… and then i had two more years for just basic stuff and simple consumption of online stuff. Ik it is a different process but i cannot imagine someone going through their silent period as a freshman, it just bad. And i might mention how our uni just lack the english speaking for some reason, our humanities department even publish news in their X account in the first language, it is insane!. So idk what to say, thats why my topic is only focusing on the english speaking in classroom at all times.

I will only use qualitative method, it just pure research and all.

Google scholar have not been a great help, there are a lot of stuff and nothing was talking about what i wanted, is there other ways to search for what i want but in a way where i can get clear answers? Any books recommendations? I do wanna see if there are experimentations about this but i cant find anything when i search. Idk how this searching works tbh maybe i asked the wrong questions in the google scholar.

So i just want recommendations. About books, approaches, anything that i could read or watch, anything at all.

In case someone gave me a recommendation, i wonder if i should reference your Reddit comment in my research? Bc if I reference someone my acc will be there so i really dont want that so i wonder if you have other ways where i could reference you?

(Im new to this research hole, first time im taking research methods in my life so you might understand the struggle )