Remember pack refreshes?
Sims 4 has an absurd amount of DLC. New players can't get all features without spending a truly unreasonable amount of money; longtime players have issues with lag, save corruption, and bugs due to the sheer size of the game and amount of parts interacting. It's time for EA to go back to the apparently-abandoned "pack refresh" concept that they introduced a couple years ago and tune up old packs rather than keep stacking more on top of the increasingly wobbly pile.
Dine Out is the most desperately in need of a work-over, since even at release it didn't quite work properly and time hasn't been kind to it.
GTW and Island Living could both benefit from some attention to their respective occults to give aliens and mermaids the amount of gameplay that vampires, werewolves and spellcasters have.
Jungle Adventure could use some kind of in-world reason why it's okay in the modern day to just traipse into a foreign country, dig up their cultural artifacts and take them home... But also it'd be a good opportunity to bring back the Adventurer career?
Snowy Escape's signature skills are hampered by only being usable in Mt. Komorebi. Adding build items (e.g. a snowboard halfpipe like previous games had, a placeable climbing wall) to let players bring those into other worlds would be nice.
HSY active school is actually pretty boring due to how much of it consists of Sims just sitting at their desk, looking at the whiteboard. Sims need some interactions they can perform during class!
Really, what this comes to is that I'm begging EA to slow down the new DLC churn due to the worsening quality/bug issues. Focusing on refreshing existing packs rather than adding new EPs or GPs would give players enough to look forward to to keep from getting bored while avoiding making the game's existing problems worse.