If that field is "new", any local game studio will probably be more willing to hire people with no formal degree.
From what I've read, that Orango is more like a beginner's introduction course. Like maybe one week or three worth of study of a topic. And it's aimed more at giving people opportunity to try out if they would like a thing or not. (But maybe I've read about the wrong thing.)
This should give you enough knowledge to have structure in creating your own games on Itch and for jams that should be more than enough to have fun in creating a game from beginning to end.
But you seem to ask and aim for game designer. That's a specialist occupation in big teams.
If you wonder how those specialists started, I suggest you pick a few games, favorably created in your country, and look at the credits at places like https://www.mobygames.com/ Do they have a game designer that only did game design? And how does their previous credit history look like. If they are famous, maybe they have a public listing of their previous work or education.