Some things I think they should do to help improve progression for main story quests.

1) any and all dungeons and trials required for msq's should be added to the main scenario roulette. As it stands for that roulette there is only the first 2 lv 50 dungeons for msq that you get. Also the main scenario roulette should be available to every one and not locked behind a wall of dungeons and trials to be cleared to unlock it. Doing this will help a lot of people get through the msq dungeons/trials

2) Switch the mentor roulette so that isn't locked behind a wall of needing to have everything cleared to do it, make it so all mentors can do the roulette for what it is they have cleared. As it is right now there is a ton of mentors that are not able to do it because they don't have clears for everything, mean while any and all new players are suffering because of it.