A question for those who play small worlds in the long term

I found the cutest small world that is an island.  This island is set for the supernatural part of the game.  There is about every occult creature, except the genie, which I ended up creating and putting in the game save I am playing.  The name of this world is Silverhollow.  Here is a link for any who want to check it out.

https://simsrebelcreators.wordpress.com/2016/10/07/silverhollow-world-save-sims-3/ 

 I do have my age set up for a little longer than the normal setting.  Here are the age settings that I finally found that I am happy with.  Gives my sims time to do things and learn things before hitting adulthood.  Baby 5 days, Toddler 15 days, Child 30 days, Teen 30 days, YA 60 days, Adult 60 days, Elder 50 days.

There are 3 empty homes at the moment, and one of those homes is on a 10x10 lot.  I looked inside it and it looks more like a studio apartment, cute, but not meant for any family size past a couple.  There are not any empty lots in this world.

I have a question for anyone who plays Small Worlds, how do you keep the world going for future generations?