These are a few things that come to my mind.

Approach 1 - Highly Cited Papers

Read only important research papers (say only highly cited) from the point of doing Mind Mapping to find out narrow gaps (Bibliometric cluster analysis will also confirm the gaps) and reach to research questions and objectives.

Approach 2 - Future Scope

Read all the research papers from point of view to read future scope (in discussion and conclusion) for other researchers to carry ahead - This will give a list of research questions and objectives. Choose one of them.

Approach 3 - Industry Feedback

To hear from industry, what are the pain points or gaps that need to be addressed in terms of solution, find out if someone has written a research paper about it if not take narrow if further for research questions and objectives.

Approach 4 - Established Concepts, Constructs, and Theories

Read only important research papers (say only highly cited) from the point of finding out the established concepts, constructs and theories (and laws), find out if there is any area which is weak or has gaps where new concepts, constructs and theories (and laws) can be developed.

Approach 5 - Questionnaires and Surveys

Go through the various questionnaire of thesis topic/subtopic from thesis and dissertations written by others, find out if there is any area in which survey is not done or questionnaire is not asked, but there is potential to get insight and data in that area, read those thesis and dissertations come up with list of research questions and objectives.

After following one of the approaches (or combo) literature review will follow, which will then help on research design & methodology, research type etc . Based on which 3 thesis related research papers and thesis can be written, Is my understanding correct? Are there other more approaches?