Sadly, another option is to pay to get through that content. Finding the people who are willing to run is diminishing day by day as that particular content is just not worth running.

But I think another reason is that being a social game and you not finding people is a result of not having networked enough to find "friends" willing to run with you. If your in a FC that is not running such content then find another group/FC. If you stay then that is on you, some are not as driven as others to get through content and prefer a more leisure pace.

Ultimately something has to give, you actively search out a group or FC willing to take you in and help you, or you remain where you are. You have to find friends, people won't search you out unless your REALLY good, have a charming personality, or willing to offer (insert something *cough* naughty or nice here) that would attract their attention.