question Finding end-users for 4L domains

[M.Y]

hi,

wanted to ask about discovering end-users. when doing this for normal words/phrases like 'web design' or 'bathrooms', you can search in google and get many results for companies using those terms. However, for a 4L acronym, there's hardly anything in search results.

so are there other ways to discover potential end-users for 4L domains?
thanks,