-Request- Make sims 4 sims act more like sims 2 sims?

I think the main problem is how the emotions and traits are handled by the game. They don't have a lasting impact on a sim, and most sims react similarly to the same situations because most of the traits or emotions don't set them apart in any way. Three basic traits just don't make an exciting sim.

TS2 has several layers of personality (personality points and aspirations, plus secondary aspirations) with a variety of options that could go several ways (wishes and wants triggered by aspirations and things that happen to the sims, along with needs that are in several ways harder to manage than in TS4, and the possibility of aspiration failure and fears, which makes it a bit harder but also more interesting to care for the sims). Sims 3 lacks some of this, but does have more traits per sim, more choices, they're more impactful, and they are also more useful than in TS4 (where several tend to become more of a nuisance after a while).

I guess you could go around some of these problems with mods and work with what you have, but you can't make a completely new game out of it. You could probably make it a somewhat more interesting game, though (doesn't take a lot).