not a BN but passing on what BNs have told me:
im noticing a lot more sliders than circles in this map and IMO you should have around a 1:1 ratio at most (with preferably more circles). this is because newbies literally cant drag objects that well and prefer to click everything.
at 238bpm im not entirely sure if thats still the "best" way to handle a low diff but definitely be sure to check out other ranked sets with low diffs and do some cross-referencing to be safe