Well your avy is a great place to start,make you a cute blue eyed blonde haired witch,you can then enjoy all the witchy supernatural things.The couldron the voodoo doll the spellbook the crystal ball,knocking out and utilizing premium content right there.Also as mentioned Supernatural stuff like mixing elixirs and throwing them at sims.
Then for lots you can make a bar set as a supernatural hangout and with you mixing up elixirs turning the townsfolk into a mythological creature freakshow you will have lots of friends.
Quick tip for busy lots is
!: Add some sims to empty houses,the issue is you have a huge town spreading the population among all those places so if you have 10 community lots and only assuming three show up at each that is 30 people right there.
2: Most importantly sims of a feather flock together,households go together places which is why you see like all the Lau Sister's at the same lot or all the Parrott girls.If you populate some empty houses with larger amount of members when they go to a place they go together.So if you make a big 7 bdrm house with 7 sims in it if you are ever visiting the library etc and one member of that house decides to go most likely you will see the other six or majority anyway.Now use this same concept among several houses you will have busy venues.So place 5 sims in that 5 bdrm home and four in the 4 bedroom empty house you will see them.I love running into the sims I place when playing to see who clashes or ended up hooking up or causing mischief.
The fun of sims is not just playing but watching everything else going on too and appreciating your creations be it builds or the sims themselves.I have played games sometimes 5 or 6 days in like "Where is Denise??" etc a sim I made excited to run into them sometime or "Where is hank" the homeless looking hobo I gave the insane trait.For me anyway like chance encounters to see what my little sims are up to.