Converting a TTC (TrueType Collection) to TTF (TrueType Font) is actually a "splitting" process rather than a traditional conversion. A .ttc file is just a container holding multiple .ttf files (like a "ZIP" for fonts).
Before diving into the conversion process, it is helpful to understand what these files actually are. convert ttc font to ttf best
Benefits of Converting TTC to TTF
FontForge-Fusion scanned its memory. It had seen this before. Three ways to break the cage. Converting a TTC (TrueType Collection) to TTF (TrueType