If it's losing momentum it's due to people not pursuing interaction, waiting for interaction to come to them. If you don't talk to people they don't talk to you.

I once had an entire group of adventurers complain of such when they elected to get jobs in the town. They blatantly ignored the adventurer's guild posting board, the thief that picked their pockets, the overturned wagon that needed righting, and more. If you don't seek interaction, if you stay at home all the time, you don't experience things.