HEY, BOO!
So we both know that The Sims 4 is lacking when it comes to traits. That's why the modding community always comes in the clutch. There are over 100 traits linked below for you to download and put in your game. I think having more traits makes your sims have better personalities. That's just my opinion.
Make sure you check the last update on these traits. The Sims does regular game updates and that can make mods go out of date.