The titles were never intended to be permanent.
Just do what I am doing - enjoy the titles while you have them, think back on fond memories of tackling a challenge with friends (you did them with friends and not a bunch of assholes you can't stand who you were just using for times, right?), show them off in Shrine while you play ESO on another screen, etc.
If you are upset about losing them you shouldn't have been farming them in the first place.