Prefixing commands solves the namespace problem and discoverability (at least partly). I use a slightly more sophisticated method, which helps me remember which custom utilities are available and how to use them: sd [1], a light wrapper written for zsh that, in addition to namespaces, provides autocompletion, custom help texts + some other QoL enhancements. Can definitely recommend if you're looking for something a bit more fancy.

[1] https://github.com/ianthehenry/sd