Writing an essay about decision making.
Is there a better way to say "that has to come"?
Saying “endure the difficulties that has to come” is not correct, because “has” is only used when the noun is singular. If you want “difficulties” to be more than one (as opposed to “difficulty”) you must use have.
Endure the difficulties that have to come.
Endure the difficulty that has to come.
And if you are looking for other ways to say it:
Endure the difficulties that must/will come.
Endure the difficulties that approach.
Endure the difficulties that are imminent.
Hope this helps!