As the game goes on for longer and longer, the rate of new collections had slowed down. There were only 4 new collections in 2023, and 2 in 2024 out of the 100+ in the game. This, of course, makes sense as the upkeep on the current collections becomes a bigger task. I want to suggest some collections that would be the most sensible moving forward, and fill some gaps in the E of CUE.
Lakes and Ponds (Oceans)
Recordbreakers (History)
Strange Psychology (Science, @thorny obsidian has a post about that)
It's Economic (Science, derived from Money, Money, Money)
Holidays (I have some ideas for this one)