Hey There!!
Your best answer choice will be is Were.
Because You were the most important person at the time makes sense. But, If you put You was the important person at the time doesn't make sense at all... Hope This Helps!!
By ♡~Itsbrazts♡~
The right answer you are looking for is denotation
Well, since jaunt and excursion mean relatively the same things, they are near synonyms, we are looking here for a word that has a relatively similar meaning to that of 'resignation'. Since you didn't give us any examples, I will just list you some of its synonyms: departure, retirement, termination, abdication, leaving, notice, abandonment, withdrawal, etc.