I love party mode, but I think it desperately needs some randomization and variety to keep it interesting so people actually queue up and play (I've legitimately spent up to 20-30 minutes waiting for a match). I get that the mode is designed with speed/efficiency in mind which means randomization could slow you down, but I'd rather have variety and replayability instead of just playing the exact same order of events each match.
Speed Run - This mode simply needs to have unique courses set up on more maps instead of just Tiki Towers. I feel this mode's design is simple (and fun) enough that just changing up the maps would make it more replayable.
What's Cookin'? - Not sure if other maps would work for this mode, but that would still be welcome. What this mode mostly needs is different, randomized recipes each round so that you aren't just doing the exact same thing. This mode is fun when it's chaotic and when you have the ingredient order memorized it loses that fun chaos of frantically trying to find and throw the ingredients in.
Get Lit - More maps would definitely help with this mode as well but I'd also like to see randomized layout of lanterns. Similarly to What's Cookin'? this mode is too formulaic after doing it so many times. Just moving some of the floating platforms around and the arrangement of lanterns could make a big difference in replayability.
Dig It - This mode thankfully already has randomization to it so I think it really could just be implemented on more maps or have more fossils to piece together. N. Sanity Caverns, Just Beachy and Calamity Canyon could work as maps, although lava wouldn't really fit.
Bounce Balloons - Again variety would help with this mode as well. Just moving around the balloon locations and changing the required balloons is all this mode really needs. Other maps could be fun just for change of environment but it's not really necessary since you spend most of your time bouncing in the air.

