Narrowing a broad area down to a specific organisation, process, or dataset is the single most useful step in choosing a supply chain dissertation topic. "Supply chain resilience" describes a genuine research area, but it isn't yet a topic; "how food retailers in a specific national market rebuilt supplier resilience following pandemic era disruption" is specific enough to defend inside a marking rubric and to actually research within a dissertation's word count. Strong supply chain dissertations don't just describe a framework, SCOR, lean and agile models, Porter's value chain, the triple bottom line, they apply it critically to a specific case, organisation, or dataset rather than treating it as a checklist to fill in.
Weak structure and an unclear argument are two of the most common problems students run into once writing starts, which is why a clear chapter by chapter plan before writing begins matters as much as the topic itself. Difficulty with data analysis is another recurring issue, and this usually comes down to matching the analysis method, SPSS, thematic analysis, framework analysis, to your actual research question rather than picking a method first and forcing the data to fit. For students juggling coursework or placements alongside the dissertation, breaking the project into chapter sized, deadline bound stages, literature review, methodology, findings, discussion, tends to keep momentum better than treating it as one enormous task.