Latest official additions and updates from EA might be incompatible with older mod releases, so be sure to do some compatibility double-checking before you throw everything together. It can take some work to figure out which mods will play nicely together and which will leave your game with a tangle of bugs. You'll also find that some of the bigger Sims 4 modders-including LittleMsSam and KawaiiStacie-have dedicated websites for their own catalogue of modded additions.
A more recent option to take a look at is Sims 4's official modding support through CurseForge, available at the Official Mod Hub for Sims 4. Whether your mod of choice is just a small tweak or a total rework, you'll find it there. Nearly a decade after release, countless new Sims 4 mods drop every day on ModTheSims- the longtime platform standard for browsing the Sims 4 mod selection.