Sounds like you need a variety to your gameplay. I suggest making different Timeline Game Saves. If you have most of the packs, you can use Sulani & Tartosa Worlds for an Ancient Times play with Greeks, Romans & Egyptians.
With a another new Game Save you can use Windenburg, Henford, Brindleton Bay & Glimmerbrook for a Medieval or Georgian play with Knights, Nobels, Peasants, Pirates, Royalty & Witches/Wizards.
On the flip side with a new Game Save you can use Oasis Springs, Evergreen Harbor & Strangerville for a Futuristic SIFI play with Aliens, Hybrids & Robots.
Just remember your build codes & CAS codes, you won't need any mods/ccs/mccs. I've began this myself back in 2020 when I was bored with my Sims 4, now I have 5 Game Saves from Ancient Times to Futuristic. Also, I only play Vanilla in my PC Sims 4 & depend on my packs to change my worlds.
I promise you won't be bored again or lose ideas in your Sims 4 play if you create a variety of fun Game Saves. ;)
