They may not play nice with the latest official additions and updates from EA, so be sure to do some double-checking before you throw everything together. It can be some work to figure out which mods will work nicely together, and which will make your game come down with a digital cold. Elsewhere, you'll find that some of the bigger Sims 4 modders-including LittleMsSam and KawaiiStacie-maintain their own dedicated websites for their catalogue of modded additions. A more recent option to try is Sims 4's official modding support through CurseForge, available at the Official Mod Hub for Sims 4.
Whether the mod is a small tweak or massive rework, you'll find it there. Almost a decade after release, brand new Sims 4 mods release every day on ModTheSims-the longtime standard platform for Sims 4 for modders.