Unless you follow the semantic wiki model (https://en.wikipedia.org/wiki/Semantic_wiki) rather than the plain wiki model what the user is building is neither a knowledge base nor a second brain. Nearly all software in this area makes this mistake so it's not your fault. Links in human brains are typed (not untyped) and the regular wiki model (and web, and Obsidian) only support untyped links. If you are truly aiming to deliver software that allows users to create a personal knowledge base then please consider spending some time researching semantic web technology.