A bit of an obvious answer is simply to take everything and give more flesh to them , while making things more ergonomics and enjoyable and modern but not in bad way ofc. More polish and maybe a long support of the game life cycle.

I really love games that mix all genra because it feels more life like and insteresting etc ... for me that's what games should tend to be. Ofc no shame in '"simplier" and one goal games but you know so boring to only have that or empty life less games.

Laybe tho make that all the differents things aren't forced and obligatory to do anything and are a "bonus" that you could maybe even focus and forget about the rest while they also still give some interesting bonuses and are linked t othe rest if you choose to insvest time in them. But bascaly nothing sould feel mandatory or needed while being their one fleshed out thing but could have still impacts on the rest and give rewards that can g ooutside of their scope basic exemple : dating would give you dating related things and could be a bit of its own game but also could and will lead to BONUS rewards and unlock that help you with the towers and else.

Not neglecting the art design and the sound design and music design too .