Q: How many connections/subtopics should I present in my bibliometric analysis and graphs?

I would approach this question in this fashion.

Ask yourself, how much information do you need from this bibliometric analysis to guide your design and development of your Pedagogy InfoDocs?

Let's say if you have 20 connections/subtopics. Are you satisfied with the results? If you are, how will you coordinate these 20 subtopics into your InfoDocs. Include all 20? If not, how many and what are they?

If these 20 do not satisfy your needs, update the criteria and conduct new analyses.

Your final bibliometric analysis and the graphs need not show exactly the numbers of subtopics that you will incorporate into the InfoDoc. Analysis and graphs are resources for you to learn these subtopics and how they relate to your selected topic. The entire bibliometric analysis and graph are ongoing processes. Throughout the InfoDocs writing process, we may need to constantly conduct new or modified analysis and graphs.