Inform users in Tor Browser of which settings are best for them based on their country
Tor Browser Launcher would, for countries where we know Tor to either work for sure or not work for sure, advise users on whether to use a bridge or not.
This does open the question of "How does Tor Launcher know the country of the user"?
I think this is at the end of the day a UX question, that can have various ways of doing it. For example you can have the user input their country (but that is maybe a bit sketchy from the users perspective) or you could show them a list of countries where tor is known to work OK and a list of where it's known to not work.